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# Recent Articles in Phys. Rev. B

## Recent articles in Physical Review B

Published: 2017-01-13T16:08:09-05:00

Effects of interactions on periodically driven dynamically localized systems

2017-01-13T10:00:00-05:00

Author(s): Adhip Agarwala and Diptiman Sen
It is known that there are lattice models in which noninteracting particles get dynamically localized when periodic δ-function kicks are applied with a particular strength. We use both numerical and analytical methods to study the effects of interactions in three different models in one dimension. T…
[Phys. Rev. B 95, 014305] Published Fri Jan 13, 2017

Topological order, symmetry, and Hall response of two-dimensional spin-singlet superconductors

2017-01-13T10:00:00-05:00

Author(s): Sergej Moroz, Abhinav Prem, Victor Gurarie, and Leo Radzihovsky

The interplay between symmetry and topology is one of the most exciting avenues of modern condensed matter research. Here, the authors propose a new and unified approach for describing the low-energy physics of two-dimensional spin-singlet superconductors, placing them in a class of topologically ordered states akin to quantum Hall fluids and spin liquids. Starting from a microscopic model of two-dimensional paired fermions with a dynamical electromagnetism (that is also confined to two spatial dimensions), the authors derive Chern-Simons theories for all spin-singlet gapped superconductors, including $s$-wave and chiral states. The topological field theories constructed here thus pave the way towards understanding superconductors as symmetry-enriched topological phases of matter.

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[Phys. Rev. B 95, 014508] Published Fri Jan 13, 2017

Large-scale normal fluid circulation in helium superflows

2017-01-13T10:00:00-05:00

Author(s): Luca Galantucci, Michele Sciacca, and Carlo F. Barenghi
We perform fully coupled numerical simulations of helium II pure superflows in a channel, with vortex-line density typical of experiments. Peculiar to our model is the computation of the back-reaction of the superfluid vortex motion on the normal fluid and the presence of solid boundaries. We recove…
[Phys. Rev. B 95, 014509] Published Fri Jan 13, 2017

Skyrmionic configuration and half-quantum vortex-antivortex pair in mesoscopic p-wave superconducting noncircular systems

2017-01-13T10:00:00-05:00

Author(s): Guo-Qiao Zha
In the framework of the microscopic Bogoliubov-de Gennes theory, we study the topological properties of skyrmionic states under applied magnetic flux in mesoscopic symmetric and asymmetric p-wave superconducting noncircular systems. For a perfect square (rectangular) sample, an enclosed square-loop-…
[Phys. Rev. B 95, 014510] Published Fri Jan 13, 2017

Elastic anharmonicity of bcc Fe and Fe-based random alloys from first-principles calculations

2017-01-13T10:00:00-05:00

Author(s): Xiaoqing Li, Stephan Schönecker, Jijun Zhao, Levente Vitos, and Börje Johansson
We systematically investigate elastic anharmonic behavior in ferromagnetic body-centered cubic (bcc) Fe and Fe_{1−x}M_{x} (M=Al, V, Cr, Co, or Ni) random alloys by means of density-functional simulations. To benchmark computational accuracy, three ab initio codes are used to obtain the complete set …
[Phys. Rev. B 95, 024203] Published Fri Jan 13, 2017

Enhanced electron-phonon coupling in graphene with periodically distorted lattice

2017-01-13T10:00:00-05:00

Author(s): E. Pomarico, M. Mitrano, H. Bromberger, M. A. Sentef, A. Al-Temimy, C. Coletti, A. Stöhr, S. Link, U. Starke, C. Cacho, R. Chapman, E. Springate, A. Cavalleri, and I. Gierz
Electron-phonon coupling directly determines the stability of cooperative order in solids, including superconductivity, charge, and spin density waves. Therefore, the ability to enhance or reduce electron-phonon coupling by optical driving may open up new possibilities to steer materials' functional…
[Phys. Rev. B 95, 024304] Published Fri Jan 13, 2017

Mode decomposition based on crystallographic symmetry in the band-unfolding method

2017-01-13T10:00:00-05:00

Author(s): Yuji Ikeda, Abel Carreras, Atsuto Seko, Atsushi Togo, and Isao Tanaka

The band-unfolding method is now widely used to calculate the effective band structures of a disordered system from its supercell model. The unfolded band structures are obtained as if the disordered system really has the crystallographic symmetry of its underlying structure. However, it has still been difficult to decompose the unfolded band structures into the modes based on the crystallographic symmetry of the underlying structure. This has prohibited detailed analyses of, e.g., selection rules and avoided band crossings for the unfolded band structures. The authors here develop a procedure to decompose the unfolded band structures according to the small representations (SRs) of the little groups. The decomposition is performed using the projection operators for SRs derived from the group representation theory. Using this procedure, the authors investigate the phonon band structure of disordered face-centered-cubic Cu${}_{0.75}$Au${}_{0.25}$, which has large variations of atomic masses and force constants among the atomic sites due to the chemical disorder. In the unfolded phonon band structure, several peculiar behaviors such as discontinuous and split branches are found in the decomposed modes corresponding to specific SRs.

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[Phys. Rev. B 95, 024305] Published Fri Jan 13, 2017

Thermodynamics and renormalized quasiparticles in the vicinity of the dilute Bose gas quantum critical point in two dimensions

2017-01-13T10:00:00-05:00

Author(s): Jan Krieg, Dominik Strassel, Simon Streib, Sebastian Eggert, and Peter Kopietz
We use the functional renormalization group (FRG) to derive analytical expressions for thermodynamic observables (density, pressure, entropy, and compressibility) as well as for single-particle properties (wave-function renormalization and effective mass) of interacting bosons in two dimensions as a…
[Phys. Rev. B 95, 024414] Published Fri Jan 13, 2017

Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices

2017-01-13T10:00:00-05:00

Author(s): S. A. Montoya, S. Couture, J. J. Chess, J. C. T. Lee, N. Kent, D. Henze, S. K. Sinha, M.-Y. Im, S. D. Kevan, P. Fischer, B. J. McMorran, V. Lomakin, S. Roy, and E. E. Fullerton
The interesting physics and potential memory technologies resulting from topologically protected spin textures such as skyrmions have prompted efforts to discover new material systems that can host these kinds of magnetic structures. Here, we use the highly tunable magnetic properties of amorphous F…
[Phys. Rev. B 95, 024415] Published Fri Jan 13, 2017

Universal properties of high-temperature superconductors from real-space pairing: t−J−U model and its quantitative comparison with experiment

2017-01-13T10:00:00-05:00

Author(s): Józef Spałek, Michał Zegrodnik, and Jan Kaczmarczyk
Selected universal experimental properties of high-temperature superconducting (HTS) cuprates have been singled out in the last decade. One of the pivotal challenges in this field is the designation of a consistent interpretation framework within which we can describe quantitatively the universal fe…
[Phys. Rev. B 95, 024506] Published Fri Jan 13, 2017

Effect of interlayer processes on the superconducting state within the t−J−U model: Full Gutzwiller wave-function solution and relation to experiment

2017-01-13T10:00:00-05:00

Author(s): Michał Zegrodnik and Józef Spałek
The Gutzwiller wave-function solution of the t−J−U model is considered for the bilayer high-T_{C} superconductor by using the so-called diagrammatic expansion method. The focus is on the influence of the interlayer effects on the superconducting state. The chosen pairing symmetry is a mixture of d_{…
[Phys. Rev. B 95, 024507] Published Fri Jan 13, 2017

Full counting statistics in the Haldane-Shastry chain

2017-01-13T10:00:00-05:00

Author(s): Jean-Marie Stéphan and Frank Pollmann
We present analytical and numerical results regarding the magnetization full counting statistics (FCS) of a subsystem in the ground state of the Haldane-Shastry chain. Exact Pfaffian expressions are derived for the cumulant generating function, as well as any observable diagonal in the spin basis. I…
[Phys. Rev. B 95, 035119] Published Fri Jan 13, 2017

Exact ensemble density functional theory for excited states in a model system: Investigating the weight dependence of the correlation energy

2017-01-13T10:00:00-05:00

Author(s): Killian Deur, Laurent Mazouin, and Emmanuel Fromager
Ensemble density functional theory (eDFT) is an exact time-independent alternative to time-dependent DFT (TD-DFT) for the calculation of excitation energies. Despite its formal simplicity and advantages in contrast to TD-DFT (multiple excitations, for example, can be easily taken into account in an …
[Phys. Rev. B 95, 035120] Published Fri Jan 13, 2017

Strong parameter renormalization from optimum lattice model orbitals

2017-01-13T10:00:00-05:00

Author(s): Valentina Brosco, Zu-Jian Ying, and José Lorenzana
Which is the best single-particle basis to express a Hubbard-like lattice model? A rigorous variational answer to this question leads to equations the solution of which depends in a self-consistent manner on the lattice ground state. Contrary to naive expectations, for arbitrary small interactions, …
[Phys. Rev. B 95, 035121] Published Fri Jan 13, 2017

Functional renormalization group approach for inhomogeneous one-dimensional Fermi systems with finite-ranged interactions

2017-01-13T10:00:00-05:00

Author(s): Lukas Weidinger, Florian Bauer, and Jan von Delft
We introduce an equilibrium formulation of the functional renormalization group (fRG) for inhomogeneous systems capable of dealing with spatially finite-ranged interactions. In the general third-order truncated form of fRG, the dependence of the two-particle vertex is described by O(N^{4}) independe…
[Phys. Rev. B 95, 035122] Published Fri Jan 13, 2017

Optical investigation of electrical spin injection into an inverted two-dimensional electron gas structure

2017-01-13T10:00:00-05:00

Author(s): M. Buchner, T. Kuczmik, M. Oltscher, M. Ciorga, T. Korn, J. Loher, D. Schuh, C. Schüller, D. Bougeard, D. Weiss, and C. H. Back
We report on electrical spin injection from (Ga,Mn)As into a high-mobility two-dimensional electron gas confined at an (Al,Ga)As/GaAs interface. Besides standard nonlocal electrical detection, we use a magneto-optical approach which provides cross-sectional images of the spin accumulation at the cle…
[Phys. Rev. B 95, 035304] Published Fri Jan 13, 2017

Conductance fluctuations and disorder induced ν=0 quantum Hall plateau in topological insulator nanowires

2017-01-13T10:00:00-05:00

Author(s): Emmanouil Xypakis and Jens H. Bardarson
Clean topological insulators exposed to a magnetic field develop Landau levels accompanied by a nonzero Hall conductivity for the infinite slab geometry. In this work we consider the case of disordered topological insulator nanowires and find, in contrast, that a zero Hall plateau emerges within a b…
[Phys. Rev. B 95, 035415] Published Fri Jan 13, 2017

Photocurrents in Weyl semimetals

2017-01-13T10:00:00-05:00

Author(s): Ching-Kit Chan, Netanel H. Lindner, Gil Refael, and Patrick A. Lee

The discovery of topological matter should be an opportunity for revolutionizing electronic devices. Nevertheless, for all their unique properties, to date there are limited feasible devices or applications based on topological materials. The work here recognizes that topological Weyl semimetal materials, through their protected gap closing and spin-orbit locking, could be used to detect low-frequency infrared radiation. Detecting infrared light electrically beyond a ten-micron wavelength is rather difficult with few ready made commercial solutions. The authors find that Weyl semimetals could provide an ideal solution for detecting mid- and far-infrared light even at room temperature. In this work, they describe the conditions of the materials to be effective photodetectors (noncentrosymmetry, doping levels etc.) and provide a detailed analysis of this photovoltaic effect.

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[Phys. Rev. B 95, 041104(R)] Published Fri Jan 13, 2017

Algorithms for tensor network renormalization

2017-01-13T10:00:00-05:00

Author(s): G. Evenbly
We discuss in detail algorithms for implementing tensor network renormalization (TNR) for the study of classical statistical and quantum many-body systems. First, we recall established techniques for how the partition function of a 2D classical many-body system or the Euclidean path integral of a 1D…
[Phys. Rev. B 95, 045117] Published Fri Jan 13, 2017

Particle-vortex symmetric liquid

2017-01-13T10:00:00-05:00

Author(s): Michael Mulligan
We introduce an effective theory with manifest particle-vortex symmetry for disordered thin films undergoing a magnetic field-tuned superconductor-insulator transition. The theory may enable one to access both the critical properties of the strong-disorder limit, which has recently been confirmed by…
[Phys. Rev. B 95, 045118] Published Fri Jan 13, 2017

Single-electron gap in the spectrum of twisted bilayer graphene

2017-01-13T10:00:00-05:00

Author(s): A. V. Rozhkov, A. O. Sboychakov, A. L. Rakhmanov, and Franco Nori
We investigate the gap in the single-electron spectrum of twisted bilayer graphene. In a perfect infinite lattice of a twisted bilayer, the gap varies exponentially in response to weak changes of the twist angle. Such a large sensitivity makes theoretical predictions of the gap nearly impossible, si…
[Phys. Rev. B 95, 045119] Published Fri Jan 13, 2017

Influence of nonmagnetic impurity scattering on spin dynamics in diluted magnetic semiconductors

2017-01-13T10:00:00-05:00

Author(s): M. Cygorek, F. Ungar, P. I. Tamborenea, and V. M. Axt
The doping of semiconductors with magnetic impurities gives rise not only to a spin-spin interaction between quasifree carriers and magnetic impurities but also to a local spin-independent disorder potential for the carriers. Based on a quantum kinetic theory for the carrier and impurity density mat…
[Phys. Rev. B 95, 045204] Published Fri Jan 13, 2017

Photoinduced giant magnetic polarons in EuTe

2017-01-13T10:00:00-05:00

Author(s): A. B. Henriques, A. R. Naupa, P. A. Usachev, V. V. Pavlov, P. H. O. Rappl, and E. Abramof
Photoinduced magnetic polarons in EuTe, with a magnetic moment of several hundred Bohr magnetons, were investigated as a function of pump intensity and temperature by pump-probe Faraday rotation. The quantum efficiency for optical generation of magnetic polarons is found to be 0.09. The pump-intensi…
[Phys. Rev. B 95, 045205] Published Fri Jan 13, 2017

Device for acoustic pulse echo experiments in the subterahertz range

2017-01-12T10:00:00-05:00

Author(s): R. Legrand, A. Huynh, S. Vincent, B. Perrin, and A. Lemaître
We present experimental results on the light-to-sound transduction by a superlattice embedded in an optical microcavity, using picosecond ultrasonics. Experiments on the ability to generate and detect phonons at 0.3 and 0.6 THz were performed at low temperature. Finally, we demonstrate that such a d…
[Phys. Rev. B 95, 014304] Published Thu Jan 12, 2017

Three-dimensional critical phase diagram of the Ising antiferromagnet CeRh_{2} Si_{2} under intense magnetic field and pressure

2017-01-12T10:00:00-05:00

Author(s): W. Knafo, R. Settai, D. Braithwaite, S. Kurahashi, D. Aoki, and J. Flouquet
Using novel instrumentation to combine extreme conditions of intense pulsed magnetic field up to 60 T and high pressure up to 4 GPa, we have established the three-dimensional (3D) magnetic field-pressure-temperature phase diagram of a pure stoichiometric heavy-fermion antiferromagnet (CeRh_{2}Si_{2}…
[Phys. Rev. B 95, 014411] Published Thu Jan 12, 2017

Shapiro spikes and negative mobility for skyrmion motion on quasi-one-dimensional periodic substrates

2017-01-12T10:00:00-05:00

Author(s): C. Reichhardt and C. J. Olson Reichhardt
Using a simple numerical model of skyrmions in a two-dimensional system interacting with a quasi-one-dimensional periodic substrate under combined dc and ac drives where the dc drive is applied perpendicular to the substrate periodicity, we show that a rich variety of novel phase-locking dynamics ca…
[Phys. Rev. B 95, 014412] Published Thu Jan 12, 2017

Efficient spin transport through polyaniline

2017-01-12T10:00:00-05:00

Author(s): J. B. S. Mendes, O. Alves Santos, J. P. Gomes, H. S. Assis, J. F. Felix, R. L. Rodríguez-Suárez, S. M. Rezende, and A. Azevedo
By using the spin pumping process, we show that it is possible to transport a pure spin current across layers of conducting polyaniline (PANI) with several hundred nanometers sandwiched between a film of the ferrimagnetic insulator yttrium iron garnet (YIG) and a thin layer of platinum. The spin cur…
[Phys. Rev. B 95, 014413] Published Thu Jan 12, 2017

Tricritical point of the f-electron antiferromagnet USb_{2} driven by high magnetic fields

2017-01-12T10:00:00-05:00

Author(s): R. L. Stillwell, I-L. Liu, N. Harrison, M. Jaime, J. R. Jeffries, and N. P. Butch
In pulsed magnetic fields up to 65 T and at temperatures below the Néel transition, our magnetization and magnetostriction measurements reveal a field-induced metamagneticlike transition that is suggestive of an antiferromagnetic to ferrimagnetic ordering. Our data also suggest a change in the natur…
[Phys. Rev. B 95, 014414] Published Thu Jan 12, 2017

Ab initio study of doping effects in the 42214 compounds: A new family of layered iron-based superconductors

2017-01-12T10:00:00-05:00

Author(s): F. Bucci, A. Sanna, G. Profeta, A. Continenza, and E. K. U. Gross

The authors present a systematic density functional theory GGA characterization of the ${R}_{4}$Fe${}_{2}$As${}_{2}$Te${}_{1-x}$O${}_{4-y}$F${}_{y}$ family of compounds (called “42214”) as a function of a set of key tuning parameters: rare earth ($R$ = Pr, Sm, and Gd), Te content, oxygen to fluorine substitutional doping, and external pressure. The analysis is based on an unfolding procedure that allows observation of the behavior of hole and electron pockets of the Fermi surface and of the nesting function. The present study includes characterization of a related hypothetical compound having Se substituting for Te. Results show that this peculiar compound family offers very good opportunities to properly harness material properties. Nesting, Fermi surface (topology and size), and magnetism can be easily modified by changing chemical composition: such tuning may lead to improved superconducting properties.

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[Phys. Rev. B 95, 014415] Published Thu Jan 12, 2017

Direct three-dimensional ordering of quasi-one-dimensional quantum dimer system near critical fields

2017-01-12T10:00:00-05:00

Author(s): Taku Matsushita, Nobuyoshi Hori, Seiya Takata, Nobuo Wada, Naoki Amaya, and Yuko Hosokoshi

As the temperature lowers in the gapless region, quantum quasi-1D spin systems show one-dimensional (1D) short-range ordering (SRO) corresponding to a Tomonaga-Luttinger liquid (TLL) by the interaction within chains, and then at lower temperatures where the small interchain interaction cannot be ignored, they have a three-dimensional (3D) long- range ordered (LRO, BEC) phase. This generally accepted scenario for the dimensional crossover of quasi-1D spin ordering, however, is debatable around the critical field, because the 1D SRO (TLL) regime has a linear boundary on the $H$-$T$ phase diagram, while the 3D LRO transition temperature has a convex shape. To this dimensionality paradox around the critical field, the authors have given the solution, experimentally by detailed analyses of the specific heat and ac susceptibility for bond-alternating antiferromagnetic chains in pentafluorophenyl nitronyl nitroxide (F${}_{5}$PNN). They reveal the existence of a definite field region near a critical field, where 3D LRO (BEC) directly occurs without passing through 1D SRO region at higher temperatures, even if the interchain interaction is sufficiently small compared to the intrachain one.

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[Phys. Rev. B 95, 020408(R)] Published Thu Jan 12, 2017

Ultrafast demagnetizing fields from first principles

2017-01-12T10:00:00-05:00

Author(s): Jacopo Simoni, Maria Stamenova, and Stefano Sanvito
We examine the ultrafast demagnetization process of iron-based materials, namely, Fe_{6} clusters and bulk bcc Fe, with time-dependent spin-density functional theory (TDSDFT). The magnetization continuity equation is reformulated and the torque due to the spin-current divergence is written in terms …
[Phys. Rev. B 95, 024412] Published Thu Jan 12, 2017

Temperature-dependent first-order reversal curve measurements on unusually hard magnetic low-temperature phase of MnBi

2017-01-12T10:00:00-05:00

Author(s): Shreyas Muralidhar, Joachim Gräfe, Yu-Chun Chen, Martin Etter, Giuliano Gregori, Semih Ener, Simon Sawatzki, Kazuhiro Hono, Oliver Gutfleisch, Helmut Kronmüller, Gisela Schütz, and Eberhard J. Goering
We have performed first-order reversal curve (FORC) measurements to investigate the irreversible magnetization processes in the low-temperature phase of MnBi. Using temperature-dependent FORC analysis, we are able to provide a clear insight into the effects of microstructural parameters such as grai…
[Phys. Rev. B 95, 024413] Published Thu Jan 12, 2017

Assessment of the Tao-Mo nonempirical semilocal density functional in applications to solids and surfaces

2017-01-12T10:00:00-05:00

Author(s): Yuxiang Mo, Roberto Car, Viktor N. Staroverov, Gustavo E. Scuseria, and Jianmin Tao
Recently, Tao and Mo developed a semilocal exchange-correlation density functional. The exchange part of this functional is derived from a density-matrix expansion corrected to reproduce the fourth-order gradient expansion of the exchange energy in the slowly-varying-density limit, while the correla…
[Phys. Rev. B 95, 035118] Published Thu Jan 12, 2017

Transport gap engineering by contact geometry in graphene nanoribbons: Experimental and theoretical studies on artificial materials

2017-01-12T10:00:00-05:00

Author(s): Thomas Stegmann, John A. Franco-Villafañe, Ulrich Kuhl, Fabrice Mortessagne, and Thomas H. Seligman
Electron transport in small graphene nanoribbons is studied by microwave emulation experiments and tight-binding calculations. In particular, it is investigated under which conditions a transport gap can be observed. Our experiments provide evidence that armchair ribbons of width 3m+2 with integer m…
[Phys. Rev. B 95, 035413] Published Thu Jan 12, 2017

Frequency-dependent magneto-optical conductivity in the generalized α−T_{3} model

2017-01-12T10:00:00-05:00

Author(s): Áron Dániel Kovács, Gyula Dávid, Balázs Dóra, and József Cserti
We have studied a generalized three-band crossing model in 2D, the generalized α−T_{3} lattice, ranging from the pseudospin-1 Dirac equation through a quadratic+flat band touching to the pseudospin-1/2 Dirac equation. A general method is presented to determine the operator form of the Green's functi…
[Phys. Rev. B 95, 035414] Published Thu Jan 12, 2017

Broken symmetry states in bilayer graphene in electric and in-plane magnetic fields

2017-01-12T10:00:00-05:00

Author(s): Junji Jia, P. K. Pyatkovskiy, E. V. Gorbar, and V. P. Gusynin
Broken symmetry states in bilayer graphene in perpendicular electric E_{⊥} and in-plane magnetic B_{∥} fields are studied in the presence of the dynamically screened long-range Coulomb interaction and the symmetry-breaking contact four-fermion interactions. The integral gap equations are solved nume…
[Phys. Rev. B 95, 045410] Published Thu Jan 12, 2017

Order, disorder, and tunable gaps in the spectrum of Andreev bound states in a multiterminal superconducting device

2017-01-12T10:00:00-05:00

Author(s): Tomohiro Yokoyama, Johannes Reutlinger, Wolfgang Belzig, and Yuli V. Nazarov
We consider the spectrum of Andreev bound states (ABSs) in an exemplary four-terminal superconducting structure where four chaotic cavities are connected by quantum point contacts to the terminals and to each other forming a ring. We nickname the resulting device 4T-ring. Such a tunable device can b…
[Phys. Rev. B 95, 045411] Published Thu Jan 12, 2017

Thermal ionization and thermally activated crossover quenching processes for 5d−4f luminescence in Y_{3} Al_{5−x} Ga_{x} O_{12} :Pr^{3+}

2017-01-11T10:00:00-05:00

Author(s): Jumpei Ueda, Andries Meijerink, Pieter Dorenbos, Adrie J. J. Bos, and Setsuhisa Tanabe
We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr^{3+}-doped Y_{3}Al_{5−x}Ga_{x}O_{12}. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f^{2}:^{3}P_{J} stat…
[Phys. Rev. B 95, 014303] Published Wed Jan 11, 2017

Effective magnetic interactions in spin-orbit coupled d^{4} Mott insulators

2017-01-11T10:00:00-05:00

Author(s): Christopher Svoboda, Mohit Randeria, and Nandini Trivedi
Transition metal compounds with the (t_{2g})^{4} electronic configuration are expected to be nonmagnetic atomic singlets both in the weakly interacting regime due to spin-orbit coupling, as well as in the Coulomb dominated regime with oppositely aligned L=1 and S=1 angular momenta. However, starting…
[Phys. Rev. B 95, 014409] Published Wed Jan 11, 2017

High-field magnetization of Heusler compound Fe_{2} Mn_{1−x} V_{x} Si

2017-01-11T10:00:00-05:00

Author(s): Masahiko Hiroi, Tomoya Tazoko, Hiroaki Sano, Iduru Shigeta, Keiichi Koyama, Akihiro Kondo, Koich Kindo, Hirotaka Manaka, and Norio Terada
Fe_{2}MnSi exhibits a ferromagnetic transition at T_{C}∼230 K and another transition to a phase with antiferromagnetic components at T_{A}∼60 K. By substituting V for Mn, so as to obtain Fe_{2}Mn_{1−x}V_{x}Si, T_{A} is revealed to decrease with x and then vanish around x∼0.2. In this study, the phas…
[Phys. Rev. B 95, 014410] Published Wed Jan 11, 2017

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd_{2} Re_{2} O_{7}

2017-01-11T10:00:00-05:00

Author(s): Jun-ichi Yamaura, Keiki Takeda, Yoichi Ikeda, Naohisa Hirao, Yasuo Ohishi, Tatsuo C. Kobayashi, and Zenji Hiroi
The 5d-transition-metal pyrochlore oxide Cd_{2}Re_{2}O_{7}, which was recently suggested to be a prototype of the spin-orbit-coupled metal [Phys. Rev. Lett. 115, 026401 (2015)], exhibits an inversion-symmetry-breaking (ISB) transition at 200 K and a subsequent superconductivity below 1 K at ambient …
[Phys. Rev. B 95, 020102(R)] Published Wed Jan 11, 2017

Role of orbital filling on nonlinear ionic Raman scattering in perovskite titanates

2017-01-11T10:00:00-05:00

Author(s): Mingqiang Gu and James M. Rondinelli
The linear and nonlinear phononic interactions between an optically excited infrared (IR) or hyper-Raman mode and a driven Raman mode are computed for the d^{0} (CaTiO_{3}) and d^{1} (LaTiO_{3}) titanates within a first-principles density functional framework. We calculate the potential energy surfa…
[Phys. Rev. B 95, 024109] Published Wed Jan 11, 2017

Field-induced magnetic states in holmium tetraboride

2017-01-11T10:00:00-05:00

Author(s): D. Brunt, G. Balakrishnan, A. R. Wildes, B. Ouladdiaf, N. Qureshi, and O. A. Petrenko
A study of the zero field and field induced magnetic states of the frustrated rare earth tetraboride HoB_{4} has been carried out using single crystal neutron diffraction complemented by magnetization measurements. In zero field, HoB_{4} shows magnetic phase transitions at T_{N1}=7.1 K to an incomme…
[Phys. Rev. B 95, 024410] Published Wed Jan 11, 2017

Computational investigation of half-Heusler compounds for spintronics applications

2017-01-11T10:00:00-05:00

Author(s): Jianhua Ma, Vinay I. Hegde, Kamaram Munira, Yunkun Xie, Sahar Keshavarz, David T. Mildebrath, C. Wolverton, Avik W. Ghosh, and W. H. Butler

The authors investigate the properties of 378 half-Heusler compounds using density functional theory with the goal of identifying promising candidates for spintronic applications, e.g. half-metals. Although DFT has often been applied to the search for half-metals, this study may be the most comprehensive attempt to identify which of the compounds predicted by DFT to be half-metals are likely to be fabricated. The calculated formation energy of each of the 378 potential half Heuslers was compared to that of all competing phases and combination of phases in the Open Quantum Materials Database. Those semiconductors, half-metals, and near half-metals within an empirically determined 0.1 eV/atom hull distance margin for neglected effects were deemed of interest for further experimental investigation.

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[Phys. Rev. B 95, 024411] Published Wed Jan 11, 2017

Dual coupling effective band model for polarons

2017-01-11T10:00:00-05:00

Author(s): Dominic J. J. Marchand, Philip C. E. Stamp, and Mona Berciu
Nondiagonal couplings to a bosonic bath completely change polaronic dynamics, from the usual diagonally coupled paradigm of smoothly varying properties. We study, using analytic and numerical methods, a model having both diagonal Holstein and nondiagonal Su-Schrieffer-Heeger (SSH) couplings. The cri…
[Phys. Rev. B 95, 035117] Published Wed Jan 11, 2017

Frequency-dependent dielectric function of semiconductors with application to physisorption

2017-01-11T10:00:00-05:00

Author(s): Fan Zheng, Jianmin Tao, and Andrew M. Rappe
The dielectric function is one of the most important quantities that describes the electrical and optical properties of solids. Accurate modeling of the frequency-dependent dielectric function has great significance in the study of the long-range van der Waals (vdW) interaction for solids and adsorp…
[Phys. Rev. B 95, 035203] Published Wed Jan 11, 2017

Effects of anisotropy and Coulomb interactions on quantum transport in a quadruple quantum-dot structure

2017-01-11T10:00:00-05:00

Author(s): M. Yu. Kagan, V. V. Val'kov, and S. V. Aksenov
We present an analytical and numerical investigation of the spectral and transport properties of a quadruple quantum-dot (QQD) structure which is one of the popular low-dimensional systems in the context of fundamental quantum physics study, future electronic applications, and quantum calculations. …
[Phys. Rev. B 95, 035411] Published Wed Jan 11, 2017

Photon-assisted transport in bilayer graphene flakes

2017-01-11T10:00:00-05:00

Author(s): D. Zambrano, L. Rosales, A. Latgé, M. Pacheco, and P. A. Orellana
The electronic conductance of graphene-based bilayer flake systems reveals different quantum interference effects, such as Fabry-Pérot resonances and sharp Fano antiresonances on account of competing electronic paths through the device. These properties may be exploited to obtain spin-polarized curr…
[Phys. Rev. B 95, 035412] Published Wed Jan 11, 2017

Erratum: Rashba scattering in the low-energy limit [Phys. Rev. B 93, 245309 (2016)]

2017-01-11T10:00:00-05:00

Author(s): Joel Hutchinson and Joseph Maciejko

[Phys. Rev. B 95, 039902] Published Wed Jan 11, 2017

Resistivity of the insulating phase approaching the two-dimensional metal-insulator transition: The effect of spin polarization

2017-01-11T10:00:00-05:00

Author(s): Shiqi Li and M. P. Sarachik
The resistivities of the dilute, strongly interacting two-dimensional electron systems in the insulating phase of a silicon MOSFET are the same for unpolarized electrons in the absence of magnetic field and for electrons that are fully spin polarized by the presence of an in-plane magnetic field. In…
[Phys. Rev. B 95, 041301(R)] Published Wed Jan 11, 2017

Pure odd-frequency superconductivity at the cores of proximity vortices

2017-01-11T10:00:00-05:00

Author(s): Mohammad Alidoust, Alexander Zyuzin, and Klaus Halterman
After more than a decade, direct observation of the odd frequency triplet pairing state in superconducting hybrid structures remains elusive. We propose an experimentally feasible setup that can unambiguously reveal the zero energy peak due to proximity-induced equal spin superconducting triplet cor…
[Phys. Rev. B 95, 045115] Published Wed Jan 11, 2017

Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy

2017-01-11T10:00:00-05:00

Author(s): Y. Jiang, S. Thapa, G. D. Sanders, C. J. Stanton, Q. Zhang, J. Kono, W. K. Lou, K. Chang, S. D. Hawkins, J. F. Klem, W. Pan, D. Smirnov, and Z. Jiang
We perform a magnetoinfrared spectroscopy study of the semiconductor to semimetal transition of InAs/GaSb double quantum wells from the normal to the inverted state. We show that owing to the low carrier density of our samples, the magnetoabsorption spectra evolve from a single cyclotron resonance p…
[Phys. Rev. B 95, 045116] Published Wed Jan 11, 2017

Lattice thermal conductivity of Ti_{x} Zr_{y} Hf_{1−x−y} NiSn half-Heusler alloys calculated from first principles: Key role of nature of phonon modes

2017-01-11T10:00:00-05:00

Author(s): Simen N. H. Eliassen, Ankita Katre, Georg K. H. Madsen, Clas Persson, Ole Martin Løvvik, and Kristian Berland
In spite of their relatively high lattice thermal conductivity κ_{ℓ}, the XNiSn (X=Ti, Zr, or Hf) half-Heusler compounds are good thermoelectric materials. Previous studies have shown that κ_{ℓ} can be reduced by sublattice alloying on the X site. To cast light on how the alloy composition affects κ…
[Phys. Rev. B 95, 045202] Published Wed Jan 11, 2017

Magnetic, optical, and electron transport properties of n-type CeO_{2} : Small polarons versus Anderson localization

2017-01-11T10:00:00-05:00

Author(s): Taras Kolodiazhnyi, Thitirat Charoonsuk, Yu-Seong Seo, Suyong Chang, Naratip Vittayakorn, and Jungseek Hwang
We report magnetic susceptibility, electrical conductivity and optical absorption of Ce_{1−x}M_{x}O_{2} where M = Nb,Ta and 0≤x≤0.03. The dc conductivity follows a simple thermally activated Arrhenius-type behavior in the T=70–700 K range with a change in slope at T^{*}≈155 K. The high-temperature a…
[Phys. Rev. B 95, 045203] Published Wed Jan 11, 2017

Exciton states in a circular graphene quantum dot: Magnetic field induced intravalley to intervalley transition

2017-01-11T10:00:00-05:00

Author(s): L. L. Li, M. Zarenia, W. Xu, H. M. Dong, and F. M. Peeters
The magnetic-field dependence of the energy spectrum, wave function, binding energy, and oscillator strength of exciton states confined in a circular graphene quantum dot (CGQD) is obtained within the configuration interaction method. We predict that (i) excitonic effects are very significant in the…
[Phys. Rev. B 95, 045409] Published Wed Jan 11, 2017

Flexocoupling impact on the kinetics of polarization reversal

2017-01-10T10:00:00-05:00

Author(s): Ivan S. Vorotiahin, Anna N. Morozovska, Eugene A. Eliseev, and Yuri A. Genenko
The impact of flexoelectric coupling on polarization reversal and space-charge variation in thin films of ferroelectric semiconductors has been studied theoretically. The relaxation-type Landau-Khalatnikov equation together with the Poisson equation and the theory of elasticity equations have been u…
[Phys. Rev. B 95, 014104] Published Tue Jan 10, 2017

Domain walls and ferroelectric reversal in corundum derivatives

2017-01-10T10:00:00-05:00

Author(s): Meng Ye and David Vanderbilt

Materials physicists are increasingly coming to understand that domain walls in complex materials often have a life of their own. Far from being unwanted “defects”, they may have rich and interesting physics not available in the bulk material. Here, the authors use first-principles theoretical methods to consider ferroelectric domain walls in a promising family of corundum-derivative materials. Beyond studying issues of domain wall mobility and clarifying the factors that allow polarization reversal, the authors also identify an unusual set of domain-wall-specific couplings between polarization, magnetization, and chirality that they suggest may lead to new functionalities.

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[Phys. Rev. B 95, 014105] Published Tue Jan 10, 2017

Local environment effects in the magnetic properties and electronic structure of disordered FePt

2017-01-10T10:00:00-05:00

Author(s): Saleem Ayaz Khan, Ján Minár, Hubert Ebert, Peter Blaha, and Ondřej Šipr
Local aspects of magnetism of disordered FePt are investigated by ab initio fully relativistic full-potential calculations, employing the supercell approach and the coherent potential approximation (CPA). The focus is on trends of the spin and orbital magnetic moments with chemical composition and w…
[Phys. Rev. B 95, 014408] Published Tue Jan 10, 2017

Optical conductivity from pair density waves

2017-01-10T10:00:00-05:00

Author(s): Zhehao Dai and Patrick A. Lee
We present a theory of optical conductivity in systems with finite-momentum Cooper pairs. In contrast to the BCS pairing where ac conductivity is purely imaginary in the clean limit, there is nonzero ac absorption across the superconducting gap for finite-momentum pairing if we break the Galilean sy…
[Phys. Rev. B 95, 014506] Published Tue Jan 10, 2017

Tuning the electronic and the crystalline structure of LaBi by pressure: From extreme magnetoresistance to superconductivity

2017-01-10T10:00:00-05:00

Author(s): F. F. Tafti, M. S. Torikachvili, R. L. Stillwell, B. Baer, E. Stavrou, S. T. Weir, Y. K. Vohra, H.-Y. Yang, E. F. McDonnell, S. K. Kushwaha, Q. D. Gibson, R. J. Cava, and J. R. Jeffries
Extreme magnetoresistance (XMR) in topological semimetals is a recent discovery which attracts attention due to its robust appearance in a growing number of materials. To search for a relation between XMR and superconductivity, we study the effect of pressure on LaBi. By increasing pressure, we obse…
[Phys. Rev. B 95, 014507] Published Tue Jan 10, 2017

Nonreciprocal propagation of surface acoustic wave in Ni/LiNbO_{3}

2017-01-10T10:00:00-05:00

Author(s): R. Sasaki, Y. Nii, Y. Iguchi, and Y. Onose
We investigated surface acoustic wave propagation in a Ni/LiNbO_{3} hybrid device. We found that the absorption and phase velocity are dependent on the sign of the wave vector, which indicates that the surface acoustic wave propagation has nonreciprocal characteristics induced by simultaneous breaki…
[Phys. Rev. B 95, 020407(R)] Published Tue Jan 10, 2017

First-principles investigation of structural and magnetic disorder in CuNiMnAl and CuNiMnSn Heusler alloys

2017-01-10T10:00:00-05:00

Author(s): S. Aron-Dine, G. S. Pomrehn, A. Pribram-Jones, K. J. Laws, and L. Bassman
Two quaternary Heusler alloys, equiatomic CuNiMnAl and CuNiMnSn, are studied using density functional theory to understand their tendency for atomic disorder on the lattice and the magnetic effects of disorder. Disordered structures with antisite defects of atoms of the same and different sublattice…
[Phys. Rev. B 95, 024108] Published Tue Jan 10, 2017

Logarithmic entanglement lightcone in many-body localized systems

2017-01-10T10:00:00-05:00

Author(s): Dong-Ling Deng, Xiaopeng Li, J. H. Pixley, Yang-Le Wu, and S. Das Sarma
We theoretically study the response of a many-body localized system to a local quench from a quantum information perspective. We find that the local quench triggers entanglement growth throughout the whole system, giving rise to a logarithmic lightcone. This saturates the modified Lieb-Robinson boun…
[Phys. Rev. B 95, 024202] Published Tue Jan 10, 2017

Ultrafast relaxation dynamics of photoexcited Dirac fermions in the three-dimensional Dirac semimetal Cd_{3} As_{2}

2017-01-10T10:00:00-05:00

Author(s): Wei Lu, Shaofeng Ge, Xuefeng Liu, Hong Lu, Caizhen Li, Jiawei Lai, Chuan Zhao, Zhimin Liao, Shuang Jia, and Dong Sun
Three-dimensional (3D) Dirac semimetals that can be seen as 3D analogues of graphene have attracted enormous interest in research recently. In order to apply these ultra-high-mobility materials in future electronic/optoelectronic devices, it is crucial to understand the relaxation dynamics of photoe…
[Phys. Rev. B 95, 024303] Published Tue Jan 10, 2017

Skyrmion oscillations in magnetic nanorods with chiral interactions

2017-01-10T10:00:00-05:00

Author(s): M. Charilaou and J. F. Löffler
We report that in cylindrical nanorods with chiral interactions spin textures corresponding to spatial skyrmion oscillations can be stabilized depending on the initial state, as revealed by micromagnetic calculations. The skyrmion oscillation, or skyrmion-chain state, occurs when the diameter of the…
[Phys. Rev. B 95, 024409] Published Tue Jan 10, 2017

Prediction of phonon-mediated superconductivity in borophene

2017-01-10T10:00:00-05:00

Author(s): Miao Gao, Qi-Zhi Li, Xun-Wang Yan, and Jun Wang
Superconductivity in two-dimensional compounds is widely studied, not only because of its application in constructing nano-superconducting devices, but also for general scientific interest. Very recently, borophene (a two-dimensional boron sheet) has been successfully grown on the Ag(111) surface, t…
[Phys. Rev. B 95, 024505] Published Tue Jan 10, 2017

Impurity screening and stability of Fermi arcs against Coulomb and magnetic scattering in a Weyl monopnictide

2017-01-10T10:00:00-05:00

Author(s): Paolo Sessi, Yan Sun, Thomas Bathon, Florian Glott, Zhilin Li, Hongxiang Chen, Liwei Guo, Xiaolong Chen, Marcus Schmidt, Claudia Felser, Binghai Yan, and Matthias Bode
We present a quasiparticle interference study of clean and Mn surface-doped TaAs, a prototypical Weyl semimetal, to test the screening properties as well as the stability of Fermi arcs against Coulomb and magnetic scattering. Contrary to topological insulators, the impurities are effectively screene…
[Phys. Rev. B 95, 035114] Published Tue Jan 10, 2017

Dark mode–Faraday rotation synergy for enhanced magneto-optics

2017-01-10T10:00:00-05:00

Author(s): Y. Mazor, M. Meir, and Ben Z. Steinberg
We examine the efficacy of dark-mode plasmonics as a platform for enhanced magneto-optics. The dark mode of a small particle consists of two co-existing equal-intensity and mutually opposing dipolar excitations. Each of these two opposing dipoles may even resonate at or near the dark-mode frequency,…
[Phys. Rev. B 95, 035115] Published Tue Jan 10, 2017

Encoding the structure of many-body localization with matrix product operators

2017-01-10T10:00:00-05:00

Author(s): David Pekker and Bryan K. Clark
Anderson insulators are noninteracting disordered systems which have localized single-particle eigenstates. The interacting analog of Anderson insulators are the many-body localized (MBL) phases. The spectrum of the many-body eigenstates of an Anderson insulator is efficiently represented as a set o…
[Phys. Rev. B 95, 035116] Published Tue Jan 10, 2017

Resonant optical control of the spin of a single Cr atom in a quantum dot

2017-01-10T10:00:00-05:00

Author(s): A. Lafuente-Sampietro, H. Utsumi, H. Boukari, S. Kuroda, and L. Besombes

A Cr atom in a semiconductor host carries a localized spin with an intrinsic large spin to strain coupling particularly promising for the development of hybrid spin-mechanical systems. The authors demonstrate here that the spin of an individual Cr atom can be controlled optically. To optically access to the spin of an individual atom, they insert it in a cadmium telluride quantum dot. With a single Cr atom introduced in the quantum dot, the energy and polarization of the photon emitted or absorbed by the dot depends on the spin state of the magnetic atom. The authors first show that excitation with a laser beam tuned to the wavelength of one of these optical transitions can be used to initialize the state of the Cr spin and to probe its dynamics optically: the Cr behaves like an optically addressable spin-based memory. Under optical excitation exactly resonant with an absorption transition one can also enter the strong coupling regime where hybrid states of matter and light are created. The spin-dependent strong coupling with the laser field is exploited to optically tune the Cr atom’s energy levels.

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[Phys. Rev. B 95, 035303] Published Tue Jan 10, 2017

Optical absorbance and band-gap engineering of (BN)_{1−x} (C_{2} )_{x} two-dimensional alloys: Phase separation and composition fluctuation effects

2017-01-10T10:00:00-05:00

Author(s): I. Guilhon, M. Marques, L. K. Teles, and F. Bechstedt
The (BN)_{1−x}(C_{2})_{x} alloys are promising materials for band-gap engineering in two-dimensional electronics. In this work, we provide a complete scenario of statistical possibilities for the distribution of atoms and its influence on electronic and optical properties. Using first-principles cal…
[Phys. Rev. B 95, 035407] Published Tue Jan 10, 2017

Spin blockade and coherent dynamics of high-spin states in a three-electron double quantum dot

2017-01-10T10:00:00-05:00

Author(s): Bao-Bao Chen, Bao-Chuan Wang, Gang Cao, Hai-Ou Li, Ming Xiao, Guang-Can Guo, Hong-Wen Jiang, Xuedong Hu, and Guo-Ping Guo
Asymmetry in a three-electron double quantum dot (DQD) allows spin blockade, when spin-3/2 (quadruplet) states and spin-1/2 (doublet) states have different charge configurations. We have observed this DQD spin blockade near the (1,2)-(2,1) charge transition using a pulsed-gate technique and a charge…
[Phys. Rev. B 95, 035408] Published Tue Jan 10, 2017

Full counting statistics of phonon-assisted Andreev tunneling through a quantum dot coupled to normal and superconducting leads

2017-01-10T10:00:00-05:00

Author(s): Bing Dong, G. H. Ding, and X. L. Lei
We present a theoretical investigation for the full counting statistics of the Andreev tunneling through a quantum dot (QD) embedded between superconducting (SC) and normal leads in the presence of a strong on-site electron-phonon interaction using nonequilibrium Green function method. For this purp…
[Phys. Rev. B 95, 035409] Published Tue Jan 10, 2017

Sensitivity of mixing-current technique to detect nanomechanical motion

2017-01-10T10:00:00-05:00

Author(s): Yue Wang and Fabio Pistolesi
Detection of nanomechanical displacement by transport techniques has reached a high level of sensitivity and versatility. In order to detect the amplitude of oscillation of a nanomechanical oscillator, a widely used technique consists of coupling this motion capacitively to a single-electron transis…
[Phys. Rev. B 95, 035410] Published Tue Jan 10, 2017

Erratum: Analytic model of the energy spectrum of a graphene quantum dot in a perpendicular magnetic field [Phys. Rev. B 78, 195427 (2008)]

2017-01-10T10:00:00-05:00

Author(s): S. Schnez, Klaus Ensslin, M. Sigrist, and T. Ihn
[Phys. Rev. B 95, 039901] Published Tue Jan 10, 2017

Gapped excitation in dense Kondo lattice CePtZn

2017-01-10T10:00:00-05:00

Author(s): L. Harriger, S. M. Disseler, J. Gunasekera, J. Rodriguez-Rivera, J. Pixley, P. Manfrinetti, S. K. Dhar, and D. K. Singh
We report on neutron scattering and muon spin relaxation measurements of dense Kondo lattice CePtZn. The system develops long-range incommensurate magnetic order as the temperature is reduced below T_{N}=1.75 K. Interestingly, a Q-independent gap at E=0.65 meV in the energy spectrum is found to co-e…
[Phys. Rev. B 95, 041102(R)] Published Tue Jan 10, 2017

Three-dimensional organic Dirac-line materials due to nonsymmorphic symmetry: A data mining approach

2017-01-10T10:00:00-05:00

Author(s): R. Matthias Geilhufe, Adrien Bouhon, Stanislav S. Borysov, and Alexander V. Balatsky
A data mining study of electronic Kohn-Sham band structures was performed to identify Dirac materials within the Organic Materials Database. Out of that, the three-dimensional organic crystal 5,6-bis(trifluoromethyl)-2-methoxy-1H-1,3-diazepine was found to host different Dirac-line nodes within the …
[Phys. Rev. B 95, 041103(R)] Published Tue Jan 10, 2017

Kitaev honeycomb tensor networks: Exact unitary circuits and applications

2017-01-10T10:00:00-05:00

Author(s): Philipp Schmoll and Román Orús
The Kitaev honeycomb model is a paradigm of exactly solvable models, showing nontrivial physical properties such as topological quantum order, Abelian and non-Abelian anyons, and chirality. Its solution is one of the most beautiful examples of the interplay of different mathematical techniques in co…
[Phys. Rev. B 95, 045112] Published Tue Jan 10, 2017

Quantum anomalous Hall effect in ferromagnetic transition metal halides

2017-01-10T10:00:00-05:00

Author(s): Chengxi Huang, Jian Zhou, Haiping Wu, Kaiming Deng, Puru Jena, and Erjun Kan
The quantum anomalous Hall (QAH) effect is a novel topological spintronic phenomenon arising from inherent magnetization and spin-orbit coupling. Various theoretical and experimental efforts have been devoted in search of intrinsic QAH insulators. However, up to now, it has only been observed in Cr …
[Phys. Rev. B 95, 045113] Published Tue Jan 10, 2017

Quantum many-body intermetallics: Phase stability of Fe_{3} Al and small-gap formation in Fe_{2} VAl

2017-01-10T10:00:00-05:00

Author(s): Oleg Kristanovski, Raphael Richter, Igor Krivenko, Alexander I. Lichtenstein, and Frank Lechermann
Various intermetallic compounds harbor subtle electronic correlation effects. To elucidate this fact for the Fe-Al system, we perform a realistic many-body investigation based on a combination of density functional theory with dynamical mean-field theory in a charge self-consistent manner. A better …
[Phys. Rev. B 95, 045114] Published Tue Jan 10, 2017

BiTeCl and BiTeBr: A comparative high-pressure optical study

2017-01-10T10:00:00-05:00

Author(s): I. Crassee, F. Borondics, M. K. Tran, G. Autès, A. Magrez, P. Bugnon, H. Berger, J. Teyssier, O. V. Yazyev, M. Orlita, and A. Akrap
We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation β between two Rashba-split conduction bands, and the absorption γ across the band gap. In the low-pressure range, p<4 GPa, for both compounds β is approximately constant with pressure and γ decreases, in agreement with band structure calculations. In BiTeCl, a clear pressure-induced phase transition at 6 GPa leads to a different ground state. For BiTeBr, the pressure evolution is more subtle, and we discuss the possibility of closing and reopening of the band gap. Our data is consistent with a potential Weyl phase in BiTeBr at 5–6 GPa, followed by the onset of a structural phase transition above 7 GPa.
[Phys. Rev. B 95, 045201] Published Tue Jan 10, 2017

Tunable finite-sized chains to control magnetic relaxation

2017-01-09T10:00:00-05:00

Author(s): Paul D. Ekstrand, Daniel J. Javier, and Thomas Gredig
The magnetic dynamics of low-dimensional iron ion chains have been studied with regards to the tunable finite-sized chain length using iron phthalocyanine thin films. The deposition temperature varies the diffusion length during thin-film growth by limiting the average crystal size in the range from…
[Phys. Rev. B 95, 014406] Published Mon Jan 09, 2017

Growth of EuO single crystals at reduced temperatures

2017-01-09T10:00:00-05:00

Author(s): Daniel C. Ramirez, Tiglet Besara, Jeffrey B. Whalen, and Theo Siegrist
Single crystals of (Eu_{1−x}Ba_{x})O have been grown in a molten barium-magnesium metal flux at temperatures up to 1000 °C, producing single crystals of (Eu_{1−x}Ba_{x})O with barium doping levels ranging from x=0.03 to x=0.25. Magnetic measurements show that the ferromagnetic Curie temperature T_{C…
[Phys. Rev. B 95, 014407] Published Mon Jan 09, 2017

Impurity effects on BCS-BEC crossover in ultracold atomic Fermi gases

2017-01-09T10:00:00-05:00

Author(s): Yanming Che, Leifeng Zhang, Jibiao Wang, and Qijin Chen
We present a systematic investigation of the effects of “nonmagnetic” impurities on the s-wave BCS-BEC crossover in atomic Fermi gases within a pairing fluctuation theory. Both pairing and impurity scattering T matrices are treated self-consistently at the same time. While the system is less sensiti…
[Phys. Rev. B 95, 014504] Published Mon Jan 09, 2017

8π-periodic dissipationless ac Josephson effect on a quantum spin Hall edge via a quantum magnetic impurity

2017-01-09T10:00:00-05:00

Author(s): Hoi-Yin Hui and Jay D. Sau
Time-reversal invariance places strong constraints on the properties of the quantum spin Hall edge. One such restriction is the inevitability of dissipation in a Josephson junction between two superconductors formed on such an edge without the presence of interaction. Interactions and spin-conservat…
[Phys. Rev. B 95, 014505] Published Mon Jan 09, 2017

Pressure-induced structural evaluation and insulator-metal transition in the mixed spinel ferrite Zn_{0.2} Mg_{0.8} Fe_{2} O_{4}

2017-01-09T10:00:00-05:00

Author(s): S. Rahman, Sudeshna Samanta, D. Errandonea, Shuai Yan, Ke Yang, Junling Lu, and Lin Wang
The effect of pressure on the electronic properties and crystal structure in a mixed spinel ferrite Zn_{0.2}Mg_{0.8}Fe_{2}O_{4} was studied for the first time up to 48 GPa at room temperature using x-ray diffraction, Raman spectroscopy, and electrical transport measurements. The sample was cubic (sp…
[Phys. Rev. B 95, 024107] Published Mon Jan 09, 2017

Effect of negative chemical pressure on the prototypical itinerant magnet MnSi

2017-01-09T10:00:00-05:00

Author(s): C. Dhital, M. A. Khan, M. Saghayezhian, W. A. Phelan, D. P. Young, R. Y. Jin, and J. F. DiTusa
The evolution of the magnetic and charge transport properties of the itinerant magnetic metal MnSi with the substitution of Al and Ga on the Si site is investigated. We observe an increase in unit cell volume indicating that both Al and Ga substitutions create negative chemical pressure. There are s…
[Phys. Rev. B 95, 024407] Published Mon Jan 09, 2017

Chiral charge pumping in graphene deposited on a magnetic insulator

2017-01-09T10:00:00-05:00

Author(s): Michael Evelt, Hector Ochoa, Oleksandr Dzyapko, Vladislav E. Demidov, Avgust Yurgens, Jie Sun, Yaroslav Tserkovnyak, Vladimir Bessonov, Anatoliy B. Rinkevich, and Sergej O. Demokritov

Yttrium iron garnet (YIG) holds a special place among all magnetic materials since it shows an unprecedentedly small magnetic damping, resulting in the narrowest known line in ferromagnetic resonance and enabling propagation of spin waves over long distances. Due to these unique characteristics, YIG films have been recently considered as a promising material for spintronic and magnonic applications. By combining YIG and a single layer of graphene in a bilayer, one obtains a unique model system for investigations of magnetic interfacial effects. Here, the authors demonstrate experimentally that the system shows a sizable chiral charge pumping, which could arise from an imbalance of screw dislocations. The effect, which cannot be attributed to the ordinary spin pumping, reveals itself in the creation of a dc electric field/voltage in graphene as a response to the dynamic magnetic excitations (spin waves) in an adjacent out-of-plane magnetized YIG film. The authors show that the induced voltage changes its sign when the orientation of the static magnetization is reversed, clearly indicating the broken mirror reflection symmetry about the planes normal to the graphene/YIG interface. The strength of effect shows a nonmonotonic dependence on the spin-wave frequency, in agreement with the proposed theoretical model.

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[Phys. Rev. B 95, 024408] Published Mon Jan 09, 2017

Development of spin-wave-like dispersive excitations below the pseudogap temperature in the high-temperature superconductor La_{2−x} Sr_{x} CuO_{4}

2017-01-09T10:00:00-05:00

Author(s): M. Matsuura, S. Kawamura, M. Fujita, R. Kajimoto, and K. Yamada
Inelastic neutron scattering measurements of magnetic excitations in hole-doped high-T_{c} cuprates La_{2−x}Sr_{x}CuO_{4} (x=0 and 0.075) have been performed over a wide temperature range of 5–500 K extending beyond the pseudogap temperature of ∼360 K for x=0.075. For x=0, the two-dimensional spin-w…
[Phys. Rev. B 95, 024504] Published Mon Jan 09, 2017

Resolving the VO_{2} controversy: Mott mechanism dominates the insulator-to-metal transition

2017-01-09T10:00:00-05:00

Author(s): O. Nájera, M. Civelli, V. Dobrosavljević, and M. J. Rozenberg
We consider a minimal model to investigate the metal-insulator transition in VO_{2}. We adopt a Hubbard model with two orbitals per unit cell, which captures the competition between Mott and singlet-dimer localization. We solve the model within dynamical mean-field theory, characterizing in detail t…
[Phys. Rev. B 95, 035113] Published Mon Jan 09, 2017

High-order harmonic generation from gapped graphene: Perturbative response and transition to nonperturbative regime

2017-01-09T10:00:00-05:00

Author(s): Darko Dimitrovski, Lars Bojer Madsen, and Thomas Garm Pedersen
We consider the interaction of gapped graphene in the two-band approximation using an explicit time-dependent approach. In addition to the full high-order harmonic generation (HHG) spectrum, we also obtain the perturbative harmonic response using the time-dependent method at photon energies covering…
[Phys. Rev. B 95, 035405] Published Mon Jan 09, 2017

High and low thermal conductivity of amorphous macromolecules

2017-01-09T10:00:00-05:00

Author(s): Xu Xie, Kexin Yang, Dongyao Li, Tsung-Han Tsai, Jungwoo Shin, Paul V. Braun, and David G. Cahill
We measure the thermal conductivity, heat capacity and sound velocity of thin films of five polymers, nine polymer salts, and four caged molecules to advance the fundamental understanding of the lower and upper limits to heat conduction in amorphous macromolecules. The thermal conductivities vary by…
[Phys. Rev. B 95, 035406] Published Mon Jan 09, 2017

Quantum oscillations without magnetic field

2017-01-09T10:00:00-05:00

Author(s): Tianyu Liu, D. I. Pikulin, and M. Franz

Quantum oscillations are the fundamental measurement made when studying metals and semimetals. They provide information about the Fermi surface by measuring interference of particles drifting around it in a magnetic field. So far it was only possible to measure them by applying an external magnetic field. Here, the authors argue that the deformation of the Dirac/Weyl semimetal can produce a strong enough pseudo-magnetic field to measure quantum oscillations in the strength of the strain. They argue that the effect of the strain is identical to the effect of the real magnetic field at energies close to the Dirac/Weyl points. They propose a setup in which the strain can be tuned continuously, and in which the quantum oscillations can be first observed in the complete absence of a magnetic field.

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[Phys. Rev. B 95, 041201(R)] Published Mon Jan 09, 2017

Symmetry-protected topological entanglement

2017-01-09T10:00:00-05:00

Author(s): Iman Marvian
We propose an order parameter for the symmetry-protected topological (SPT) phases which are protected by Abelian on-site symmetries. This order parameter, called the SPT entanglement, is defined as the entanglement between A and B, two distant regions of the system, given that the total charge (asso…
[Phys. Rev. B 95, 045111] Published Mon Jan 09, 2017

Imaging snake orbits at graphene n−p junctions

2017-01-09T10:00:00-05:00

Author(s): K. Kolasiński, A. Mreńca-Kolasińska, and B. Szafran
We consider conductance mapping of the snake orbits confined along the n−p junction defined in graphene by the electrostatic doping in the quantum Hall regime. We explain the periodicity of conductance oscillations at the magnetic field and the Fermi energy scales by the properties of the n−p juncti…
[Phys. Rev. B 95, 045304] Published Mon Jan 09, 2017

Effective g factor in black phosphorus thin films

2017-01-09T10:00:00-05:00

Author(s): Xiaoying Zhou, Wen-Kai Lou, Dong Zhang, Fang Cheng, Guanghui Zhou, and Kai Chang
We theoretically investigate the effective g factor in the black phosphorus (BP) thin films (TFs) based on a multiband k·p theory. We demonstrate that the effective single particle g factor in pristine BP TF is anisotropic arising from its anisotropic band structure with g_{xx}^{*}≈g_{yy}^{*}≈2.0 an…
[Phys. Rev. B 95, 045408] Published Mon Jan 09, 2017

Numerical analytic continuation: Answers to well-posed questions

2017-01-06T10:00:00-05:00

Author(s): Olga Goulko, Andrey S. Mishchenko, Lode Pollet, Nikolay Prokof'ev, and Boris Svistunov
We formulate the problem of numerical analytic continuation in a way that lets us draw meaningful conclusions about the properties of the spectral function based solely on the input data. Apart from ensuring consistency with the input data (within their error bars) and the a priori and a posteriori …
[Phys. Rev. B 95, 014102] Published Fri Jan 06, 2017

Manipulating charge ordering in Fe_{3} O_{4} by field cooling

2017-01-06T10:00:00-05:00

Author(s): T. P. Ma, Y. Yang, Z. Ding, Z. H. Chen, H. B. Zhao, P. Werner, Stuart S. P. Parkin, and Y. Z. Wu
The conductivity of Fe_{3}O_{4} drops two orders of magnitude below the Verwey temperature T_{v}, known as the Verwey transition, due to the formation of charge ordering (CO). Here, we report the discovery of a large birefringence effect correlated with the CO in Fe_{3}O_{4} controlled by ultrafast-…
[Phys. Rev. B 95, 014103] Published Fri Jan 06, 2017

New quantum transition in Weyl semimetals with correlated disorder

2017-01-06T10:00:00-05:00

Author(s): T. Louvet, D. Carpentier, and A. A. Fedorenko
A Weyl semimetal denotes an electronic phase of solids in which two bands cross linearly. In this paper we study the effect of a spatially correlated disorder on such a phase. Using a renormalization-group analysis, we show that in three dimensions three scenarios are possible depending on the disor…
[Phys. Rev. B 95, 014204] Published Fri Jan 06, 2017

Chaotic dynamics of a magnetic particle at finite temperature

2017-01-06T10:00:00-05:00

Author(s): O. J. Suarez, D. Laroze, J. Martínez-Mardones, D. Altbir, and O. Chubykalo-Fesenko
In this work, we study nonlinear aspects of the deterministic spin dynamics of an anisotropic single-domain magnetic particle at finite temperature modeled by the Landau-Lifshitz-Bloch equation. The magnetic field has two components: a constant term and a term involving a harmonic time modulation. T…
[Phys. Rev. B 95, 014404] Published Fri Jan 06, 2017