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Recent Articles in Phys. Rev. B

Recent articles in Physical Review B

Published: 2017-11-17T23:03:00+00:00


First-principles-based Landau-Devonshire potential for ${\mathrm{BiFeO}}_{3}$


Author(s): P. Marton, A. Klíč, M. Paściak, and J. Hlinka

The work describes a first-principles-based computational strategy for studying structural phase transitions, and in particular, for determination of the so-called Landau-Devonshire potential—the classical zero-temperature limit of the Gibbs energy, expanded in terms of order parameters. It exploits...

[Phys. Rev. B 96, 174110] Published Fri Nov 17, 2017

Evolution of magnetic phases in ${\mathrm{SmCrO}}_{3}$: A neutron diffraction and magnetometric study


Author(s): Malvika Tripathi, R. J. Choudhary, D. M. Phase, T. Chatterji, and H. E. Fischer

The classical belief about the mechanism of spin reorientation phase transition (SRPT) and ground-state magnetic structure in ${\mathrm{SmCrO}}_{3}$ has become intriguing because of inconsistent bulk magnetization observations. The presence of highly neutron-absorbing Sm atom has so far evaded the d...

[Phys. Rev. B 96, 174421] Published Fri Nov 17, 2017

Green's function formalism for spin transport in metal-insulator-metal heterostructures


Author(s): Jiansen Zheng, Scott Bender, Jogundas Armaitis, Roberto E. Troncoso, and Rembert A. Duine

We develop a Green's function formalism for spin transport through heterostructures that contain metallic leads and insulating ferromagnets. While this formalism in principle allows for the inclusion of various magnonic interactions, we focus on Gilbert damping. As an application, we consider ballis...

[Phys. Rev. B 96, 174422] Published Fri Nov 17, 2017

One dimensionalization in the spin-1 Heisenberg model on the anisotropic triangular lattice


Author(s): M. G. Gonzalez, E. A. Ghioldi, C. J. Gazza, L. O. Manuel, and A. E. Trumper

We investigate the effect of dimensional crossover in the ground state of the antiferromagnetic spin-1 Heisenberg model on the anisotropic triangular lattice that interpolates between the regime of weakly coupled Haldane chains $({J}^{′}≪J)$ and the isotropic triangular lattice $({J}^{′}=J)$. We use...

[Phys. Rev. B 96, 174423] Published Fri Nov 17, 2017

Superconductivity in engineered two-dimensional electron gases


Author(s): Andrey V. Chubukov and Steven A. Kivelson

We consider Kohn-Luttinger mechanism for superconductivity in a two-dimensional electron gas confined to a narrow well between two grounded metallic planes with two occupied subbands with Fermi momenta ${k}_{FL}>{k}_{FS}$. On the basis of a perturbative analysis, we conclude that non-$s$-wave sup...

[Phys. Rev. B 96, 174514] Published Fri Nov 17, 2017

Towards accurate models for amorphous GeTe: Crucial effect of dispersive van der Waals corrections on the structural properties involved in the phase-change mechanism


Author(s): M. Micoulaut, A. Piarristeguy, H. Flores-Ruiz, and A. Pradel

The effect of van der Waals dispersion correction in combination with density functional theory is investigated on a canonical amorphous phase-change material. Density functional theory (DFT), using the generalized gradient approximation, usually fails to reproduce the structure of amorphous telluri...

[Phys. Rev. B 96, 184204] Published Fri Nov 17, 2017

Resonant inelastic x-ray scattering probes the electron-phonon coupling in the spin liquid $κ$-(BEDT-TTF)${}_{2}{\mathrm{Cu}}_{2}{(\mathrm{CN})}_{3}$


Author(s): V. Ilakovac, S. Carniato, P. Foury-Leylekian, S. Tomić, J.-P. Pouget, P. Lazić, Y. Joly, K. Miyagawa, K. Kanoda, and A. Nicolaou

Resonant inelastic x-ray scattering at the N $K$ edge reveals clearly resolved harmonics of the anion plane vibrations in the $κ$-(BEDT-${\mathrm{TTF})}_{2}{\mathrm{Cu}}_{2}$(${\mathrm{CN})}_{3}$ spin-liquid insulator. Tuning the incoming light energy at the $K$ edge of two distinct N sites permits ...

[Phys. Rev. B 96, 184303] Published Fri Nov 17, 2017

Proximity effect model of ultranarrow NbN strips


Author(s): I. Charaev, T. Silbernagel, B. Bachowsky, A. Kuzmin, S. Doerner, K. Ilin, A. Semenov, D. Roditchev, D. Yu. Vodolazov, and M. Siegel

We show that narrow superconducting strips in superconducting (S) and normal (N) states are universally described by the model presenting them as lateral NSN proximity systems in which the superconducting central band is sandwiched between damaged edge bands with suppressed superconductivity. The wi...

[Phys. Rev. B 96, 184517] Published Fri Nov 17, 2017

Fast pulse sequences for dynamically corrected gates in singlet-triplet qubits


Author(s): Robert E. Throckmorton, Chengxian Zhang, Xu-Chen Yang, Xin Wang, Edwin Barnes, and S. Das Sarma

We present a set of experimentally feasible pulse sequences that implement any single-qubit gate on a singlet-triplet spin qubit and demonstrate that these new sequences are up to three times faster than existing sequences in the literature. We show that these sequences can be extended to incorporat...

[Phys. Rev. B 96, 195424] Published Fri Nov 17, 2017

Thermoelectric power factor of nanocomposite materials from two-dimensional quantum transport simulations


Author(s): Samuel Foster, Mischa Thesberg, and Neophytos Neophytou

Nanocomposites are promising candidates for the next generation of thermoelectric materials since they exhibit extremely low thermal conductivities as a result of phonon scattering on the boundaries of the various material phases. The nanoinclusions, however, should not degrade the thermoelectric po...

[Phys. Rev. B 96, 195425] Published Fri Nov 17, 2017

Calibration of the fine-structure constant of graphene by time-dependent density-functional theory


Author(s): A. Sindona, M. Pisarra, C. Vacacela Gomez, P. Riccardi, G. Falcone, and S. Bellucci

One of the amazing properties of graphene is the ultrarelativistic behavior of its loosely bound electrons, mimicking massless fermions that move with a constant velocity, inversely proportional to a fine-structure constant ${α}_{g}$ of the order of unity. The effective interaction between these qua...

[Phys. Rev. B 96, 201408(R)] Published Fri Nov 17, 2017

Critical divergence of the symmetric (${A}_{1g}$) nonlinear elastoresistance near the nematic transition in an iron-based superconductor


Author(s): J. C. Palmstrom, A. T. Hristov, S. A. Kivelson, J.-H. Chu, and I. R. Fisher

We report the observation of a nonlinear elastoresistivity response for the prototypical underdoped iron pnictide $\mathrm{Ba}{({\mathrm{Fe}}_{0.975}{\mathrm{Co}}_{0.025})}_{2}{\mathrm{As}}_{2}$. Our measurements reveal a large quadratic term in the isotropic (${A}_{1g}$) electronic response that wa...

[Phys. Rev. B 96, 205133] Published Fri Nov 17, 2017

Voltage-dependent cluster expansion for electrified solid-liquid interfaces: Application to the electrochemical deposition of transition metals


Author(s): Stephen E. Weitzner and Ismaila Dabo

The detailed atomistic modeling of electrochemically deposited metal monolayers is challenging due to the complex structure of the metal-solution interface and the critical effects of surface electrification during electrode polarization. Accurate models of interfacial electrochemical equilibria are...

[Phys. Rev. B 96, 205134] Published Fri Nov 17, 2017

Half-metal phases in a quantum wire with modulated spin-orbit interaction


Author(s): D. C. Cabra, G. L. Rossini, A. Ferraz, G. I. Japaridze, and H. Johannesson

We propose a spin filter device based on the interplay of a modulated spin-orbit interaction and a uniform external magnetic field acting on a quantum wire. Half-metal phases, where electrons with only a selected spin polarization exhibit ballistic conductance, can be tuned by varying the magnetic f...

[Phys. Rev. B 96, 205135] Published Fri Nov 17, 2017

Disorder-induced topological phase transitions on Lieb lattices


Author(s): Rui Chen, Dong-Hui Xu, and Bin Zhou

Motivated by the very recent experimental realization of electronic Lieb lattices and research interest on topological states of matter, we study the topological phase transitions driven by Anderson-type disorder on spin-orbit coupled Lieb lattices in the presence of spin-independent and -dependent ...

[Phys. Rev. B 96, 205304] Published Fri Nov 17, 2017

Structural properties of transition-metal clusters via force-biased Monte Carlo and ab initio calculations: A comparative study


Author(s): Dil K. Limbu, Raymond Atta-Fynn, David A. Drabold, Stephen R. Elliott, and Parthapratim Biswas

We present a force-biased Monte Carlo (FMC) method for structural modeling of the transition-metal clusters of Fe, Ni, and Cu with sizes of 13, 30, and 55 atoms. By employing the Finnis-Sinclair potential for Fe and the Sutton-Chen potential for Ni and Cu, the total energy of the clusters is minimiz...

[Phys. Rev. B 96, 174208] Published Thu Nov 16, 2017

Small influence of magnetic ordering on lattice dynamics in ${\mathrm{TaFe}}_{1.25}{\mathrm{Te}}_{3}$


Author(s): M. Opačić, N. Lazarević, D. Tanasković, M. M. Radonjić, A. Milosavljević, Yongchang Ma, C. Petrovic, and Z. V. Popović

Raman scattering spectra of zigzag spin chain ${\mathrm{TaFe}}_{1.25}{\mathrm{Te}}_{3}$ single crystal are presented in a temperature range from 80 to 300 K. Nine Raman active modes of ${A}_{g}$ and ${B}_{g}$ symmetry are clearly observed and assigned by probing different scattering channels, which ...

[Phys. Rev. B 96, 174303] Published Thu Nov 16, 2017

Fragile fate of driven-dissipative XY phase in two dimensions


Author(s): Mohammad F. Maghrebi

Driven-dissipative systems define a broad class of nonequilibrium systems where an external drive (e.g., laser) competes with a dissipative environment. The steady state of dynamics is generically distinct from a thermal state characteristic of equilibrium. As a representative example, a driven-diss...

[Phys. Rev. B 96, 174304] Published Thu Nov 16, 2017

Spin-wave propagation and spin-polarized electron transport in single-crystal iron films


Author(s): O. Gladii, D. Halley, Y. Henry, and M. Bailleul

The techniques of propagating spin-wave spectroscopy and current-induced spin-wave Doppler shift are applied to a 20-nm-thick Fe/MgO(001) film. The magnetic parameters extracted from the position of the spin-wave resonance peaks are very close to those tabulated for bulk iron. From the zero-current ...

[Phys. Rev. B 96, 174420] Published Thu Nov 16, 2017

Intrinsic ac anomalous Hall effect of nonsymmorphic chiral superconductors with an application to ${\mathrm{UPt}}_{3}$


Author(s): Zhiqiang Wang, John Berlinsky, Gertrud Zwicknagl, and Catherine Kallin

The polar Kerr effect, or equivalently the ac anomalous Hall effect, is a signature of time-reversal symmetry breaking in chiral superconductors. Seeing it requires additional ingredients, such as disorder or multiple bands. The simplest model of chiral superconductivity in UPt3, which is thought to be f wave, would not exhibit a Kerr effect. Here, it is shown that the “starfish” Fermi surface, where the bands stick together at the top and bottom of the Brillouin zone, can exhibit a Kerr effect due to multiband effects and to mixing of f- and d-wave order parameters that are respectively even and odd in the hcp sublattice index.

[Phys. Rev. B 96, 174511] Published Thu Nov 16, 2017

Emergent exotic superconductivity in artificially engineered tricolor Kondo superlattices


Author(s): M. Naritsuka, T. Ishii, S. Miyake, Y. Tokiwa, R. Toda, M. Shimozawa, T. Terashima, T. Shibauchi, Y. Matsuda, and Y. Kasahara

In the quest for exotic superconducting pairing states, the Rashba effect, which lifts the electron-spin degeneracy as a consequence of strong spin-orbit interaction (SOI) under broken inversion symmetry, has attracted considerable interest. Here, to introduce the Rashba effect into two-dimensional ...

[Phys. Rev. B 96, 174512] Published Thu Nov 16, 2017

Band structure and Fermi surfaces of the reentrant ferromagnetic superconductor $\mathrm{Eu}{({\mathrm{Fe}}_{0.86}{\mathrm{Ir}}_{0.14})}_{2}{\mathrm{As}}_{2}$


Author(s): S. Xing, J. Mansart, V. Brouet, M. Sicot, Y. Fagot-Revurat, B. Kierren, P. Le Fèvre, F. Bertran, J. E. Rault, U. B. Paramanik, Z. Hossain, A. Chainani, and D. Malterre

The electronic structure of the reentrant superconductor $\mathrm{Eu}({\mathrm{Fe}}_{0.86}{\mathrm{Ir}}_{0.14}$)${}_{2}{\mathrm{As}}_{2}$ (${T}_{c}=22$ K) with coexisting ferromagnetic order (${T}_{M}=18$ K) is investigated using angle-resolved photoemission spectroscopy and scanning tunneling spect...

[Phys. Rev. B 96, 174513] Published Thu Nov 16, 2017

Publisher's Note: Domain-width model for perpendicularly magnetized systems with Dzyaloshinskii-Moriya interaction [Phys. Rev. B 96, 144408 (2017)]


Author(s): T. N. G. Meier, M. Kronseder, and C. H. Back

[Phys. Rev. B 96, 179902] Published Thu Nov 16, 2017

Single-parameter scaling and maximum entropy inside disordered one-dimensional systems: Theory and experiment


Author(s): Xiaojun Cheng, Xujun Ma, Miztli Yépez, Azriel Z. Genack, and Pier A. Mello

The single-parameter scaling hypothesis relating the average and variance of the logarithm of the conductance is a pillar of the theory of electronic transport. We use a maximum-entropy ansatz to explore the logarithm of the particle, or energy density $ln\mathcal{W}(x)$ at a depth $x$ into a random...

[Phys. Rev. B 96, 180203(R)] Published Thu Nov 16, 2017

Spin excitation anisotropy in the optimally isovalent-doped superconductor ${\mathrm{BaFe}}_{2}{({\mathrm{As}}_{0.7}{\mathrm{P}}_{0.3})}_{2}$


Author(s): Ding Hu, Wenliang Zhang, Yuan Wei, Bertrand Roessli, Markos Skoulatos, Louis Pierre Regnault, Genfu Chen, Yu Song, Huiqian Luo, Shiliang Li, and Pengcheng Dai

We use neutron polarization analysis to study spin excitation anisotropy in the optimally isovalent-doped superconductor ${\mathrm{BaFe}}_{2}$(${\mathrm{As}}_{0.7}{\mathrm{P}}_{0.3}$)${}_{2}$ (${T}_{c}=30$ K). Different from optimally hole- and electron-doped ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, ...

[Phys. Rev. B 96, 180503(R)] Published Thu Nov 16, 2017

Nearly isotropic superconductivity in the layered Weyl semimetal ${\mathrm{WTe}}_{2}$ at 98.5 kbar


Author(s): Yuk Tai Chan, P. L. Alireza, K. Y. Yip, Q. Niu, K. T. Lai, and Swee K. Goh

The layered transition metal dichalcogenide ${\mathrm{WTe}}_{2}$ has recently attracted significant attention due to the discovery of an extremely large magnetoresistance, a predicted type-II Weyl semimetallic state, and a pressure-induced superconducting state. By a careful measurement of the super...

[Phys. Rev. B 96, 180504(R)] Published Thu Nov 16, 2017

Raman scattering study of the tetragonal magnetic phase in ${\mathrm{Sr}}_{1−x}{\mathrm{Na}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$: Structural symmetry and electronic gap


Author(s): Li Yue, Xiao Ren, Tingting Han, Jianqing Guo, Zhicheng Wu, Yan Zhang, and Yuan Li

We use inelastic light scattering to study ${\mathrm{Sr}}_{1−x}{\mathrm{Na}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ ($x≈0.34$), which exhibits a robust tetragonal magnetic phase that restores the fourfold rotation symmetry inside the orthorhombic magnetic phase. With cooling, we observe splitting an...

[Phys. Rev. B 96, 180505(R)] Published Thu Nov 16, 2017

High-resolution resonant inelastic extreme ultraviolet scattering from orbital and spin excitations in a Heisenberg antiferromagnet


Author(s): Antonio Caretta, Martina Dell'Angela, Yi-De Chuang, Alexandra M. Kalashnikova, Roman V. Pisarev, Davide Bossini, Florian Hieke, Wilfried Wurth, Barbara Casarin, Roberta Ciprian, Fulvio Parmigiani, Surge Wexler, L. Andrew Wray, and Marco Malvestuto

We report a high-resolution resonant inelastic extreme ultraviolet (EUV) scattering study of the quantum Heisenberg antiferromagnet ${\mathrm{KCoF}}_{3}$. By tuning the EUV photon energy to the cobalt ${M}_{23}$ edge, a complete set of low-energy $3d$ spin-orbital excitations is revealed. These low-...

[Phys. Rev. B 96, 184420] Published Thu Nov 16, 2017

Boundary-driven Heisenberg chain in the long-range interacting regime: Robustness against far-from-equilibrium effects


Author(s): Leon Droenner and Alexander Carmele

We investigate the Heisenberg $XXZ$ chain with long-range interactions in the $Z$ dimension. By applying two magnetic boundary reservoirs, we drive the system out of equilibrium and induce a nonzero steady-state current. The long-range coupled chain shows nearly ballistic transport and linear respon...

[Phys. Rev. B 96, 184421] Published Thu Nov 16, 2017

Surface impedance and optimum surface resistance of a superconductor with an imperfect surface


Author(s): Alex Gurevich and Takayuki Kubo

We calculate a low-frequency surface impedance of a dirty, $s$-wave superconductor with an imperfect surface incorporating either a thin layer with a reduced pairing constant or a thin, proximity-coupled normal layer. Such structures model realistic surfaces of superconducting materials which can co...

[Phys. Rev. B 96, 184515] Published Thu Nov 16, 2017

Bulk boundary correspondence and the existence of Majorana bound states on the edges of 2D topological superconductors


Author(s): Nicholas Sedlmayr, Vardan Kaladzhyan, Clément Dutreix, and Cristina Bena

The bulk-boundary correspondence establishes a connection between the bulk topological index of an insulator or superconductor, and the number of topologically protected edge bands or states. For topological superconductors in two dimensions, the first Chern number is related to the number of protec...

[Phys. Rev. B 96, 184516] Published Thu Nov 16, 2017

Charge puddles in the bulk and on the surface of the topological insulator ${\mathrm{BiSbTeSe}}_{2}$ studied by scanning tunneling microscopy and optical spectroscopy


Author(s): T. Knispel, W. Jolie, N. Borgwardt, J. Lux, Zhiwei Wang, Yoichi Ando, A. Rosch, T. Michely, and M. Grüninger

The peculiar surface transport properties of topological insulators often require tuning of the Fermi level close to the Dirac point. This, however, reduces the screening capabilities of the Dirac-like surface carriers and thus enhances the sensitivity to Coulomb disorder present in compensated materials. Coulomb disorder drives the formation of puddles, local accumulations of charge carriers both in the bulk and on the surface. In the topological insulator BiSbTeSe2, the coexistence of surface puddles and bulk puddles is revealed by scanning tunneling spectroscopy and optical spectroscopy. Quantitative analysis shows that bulk puddles contribute to the screening of surface potential fluctuations in this undoped compound. Understanding and controlling the puddles will be a key to realizing novel phenomena in 3D topological materials.

[Phys. Rev. B 96, 195135] Published Thu Nov 16, 2017

Role of the transition state in muon implantation


Author(s): R. C. Vilão, R. B. L. Vieira, H. V. Alberto, J. M. Gil, and A. Weidinger

In muon-spin-rotation experiments, positive muons are implanted in the material and come to rest in the unrelaxed host lattice. The formation of the final configuration requires a lattice relaxation which does not occur instantly. The present paper is concerned with the transition from the initial s...

[Phys. Rev. B 96, 195205] Published Thu Nov 16, 2017

Current-induced spin polarization in InGaAs and GaAs epilayers with varying doping densities


Author(s): M. Luengo-Kovac, S. Huang, D. Del Gaudio, J. Occena, R. S. Goldman, R. Raimondi, and V. Sih

The current-induced spin polarization and momentum-dependent spin-orbit field were measured in ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1−x}\mathrm{As}$ epilayers with varying indium concentrations and silicon doping densities. Samples with higher indium concentrations and carrier concentrations and lower m...

[Phys. Rev. B 96, 195206] Published Thu Nov 16, 2017

Geometrical phase shift in Friedel oscillations


Author(s): C. Dutreix and P. Delplace

This work addresses the problem of elastic scattering on a localized impurity in a one-dimensional crystal with sublattice degrees of freedom. The impurity yields long-range interferences in the local density of states known as Friedel oscillations. Here we show that the internal degrees of freedom ...

[Phys. Rev. B 96, 195207] Published Thu Nov 16, 2017

Erratum: Reliability of Raman measurements of thermal conductivity of single-layer graphene due to selective electron-phonon coupling: A first-principles study [Phys. Rev. B 93, 125432 (2016)]


Author(s): Ajit K. Vallabhaneni, Dhruv Singh, Hua Bao, Jayathi Murthy, and Xiulin Ruan

[Phys. Rev. B 96, 199903] Published Thu Nov 16, 2017

Non-necessity of band inversion process in two-dimensional topological insulators for bulk gapless states and topological phase transitions


Author(s): Wenjie Xi (奚文杰) and Wei Ku (顧威)

In commonly employed models for two-dimensional (2D) topological insulators, bulk gapless states are well known to form at the band inversion points where the degeneracy of the states is protected by symmetries. It is thus sometimes quite tempting to consider this feature, the occurrence of gapless ...

[Phys. Rev. B 96, 201110(R)] Published Thu Nov 16, 2017

Quantized charge transport in chiral Majorana edge modes


Author(s): Stephan Rachel, Eric Mascot, Sagen Cocklin, Matthias Vojta, and Dirk K. Morr

Lattices of magnetic adatoms deposited on the surface of s-wave superconductors (Shiba lattices) have been proposed as a new platform for topological superconductivity, allowing for the local manipulation and detection of Majorana modes via scanning-probe techniques. The authors demonstrate that the topological Majorana edge modes of nanoscopic Shiba islands display universal electronic and transport properties. Most remarkably, these Majorana modes possess a quantized charge conductance that is proportional to the topological Chern number (C), and carry a supercurrent whose chirality reflects the sign of C. These results establish nanoscopic Shiba islands as promising components in future topology-based devices.

[Phys. Rev. B 96, 205131] Published Thu Nov 16, 2017

Hall effect in cuprates with an incommensurate collinear spin-density wave


Author(s): M. Charlebois, S. Verret, A. Foley, O. Simard, D. Sénéchal, and A.-M. S. Tremblay

The presence of incommensurate spiral spin-density waves (SDW) has been proposed to explain the $p$ (hole doping) to $1+p$ jump measured in the Hall number ${n}_{H}$ at a doping ${p}^{*}$. Here we explore incommensurate collinear SDW as another possible explanation of this phenomenon, distinct from ...

[Phys. Rev. B 96, 205132] Published Thu Nov 16, 2017

Photomagnetoelectric and magnetophotovoltaic effects in multiferroic ${\mathrm{BiFeO}}_{3}$


Author(s): Bruno Mettout and Pierre Tolédano

A polarized light beam modifies the equilibrium tensors associated with any measurable property of a crystal. The light-induced linear magnetoelectric susceptibility and electric current density of bismuth ferrite (BFO) are investigated theoretically using their expansion in Wigner spherical functio...

[Phys. Rev. B 96, 205202] Published Thu Nov 16, 2017

Temperature dependence of hypersound attenuation in silica films via picosecond acoustics


Author(s): A. Huynh, E. Péronne, C. Gingreau, X. Lafosse, A. Lemaître, B. Perrin, R. Vacher, B. Rufflé, and M. Foret

We report picosecond acoustic measurements of longitudinal sound dispersion and attenuation in an amorphous ${\mathrm{SiO}}_{2}$ layer at temperatures from 20 to 300 K over frequencies ranging from about 40 to 200 GHz. The sample is a radio frequency cathodic sputtered silica layer grown on a sapphi...

[Phys. Rev. B 96, 174206] Published Wed Nov 15, 2017

Fate of topological states and mobility edges in one-dimensional slowly varying incommensurate potentials


Author(s): Tong Liu, Hai-Yang Yan, and Hao Guo

We investigate the interplay between disorder and superconducting pairing for a one-dimensional $p$-wave superconductor subject to slowly varying incommensurate potentials with mobility edges. With amplitude increments of the incommensurate potentials, the system can undergo a transition from a topo...

[Phys. Rev. B 96, 174207] Published Wed Nov 15, 2017

Thermodynamics of the pyrochlore Heisenberg ferromagnet with arbitrary spin $S$


Author(s): Patrick Müller, Andre Lohmann, Johannes Richter, Oleg Menchyshyn, and Oleg Derzhko

We use the rotation-invariant Green's function method (RGM) and the high-temperature expansion (HTE) to study the thermodynamic properties of the spin-$S$ Heisenberg ferromagnet on the pyrochlore lattice. We examine the excitation spectra as well as various thermodynamic quantities, such as the orde...

[Phys. Rev. B 96, 174419] Published Wed Nov 15, 2017

Cooper pair splitting in ballistic ferromagnetic SQUIDs


Author(s): P. L. Stroganov and Ya. V. Fominov

We consider ballistic SQUIDs with spin filtering inside half-metallic ferromagnetic arms. A singlet Cooper pair cannot pass through an arm in this case, so the Josephson current is entirely due to the Cooper pair splitting, with two electrons going to different interferometer arms. In order to eluci...

[Phys. Rev. B 96, 174508] Published Wed Nov 15, 2017

Multiple odd-frequency superconducting states in buckled quantum spin Hall insulators with time-reversal symmetry


Author(s): Dushko Kuzmanovski and Annica M. Black-Schaffer

We consider a buckled quantum spin Hall insulator (QSHI), such as silicene, proximity coupled to a conventional spin-singlet $s$-wave superconductor. Even limiting the discussion to the disorder-robust $s$-wave pairing symmetry, we find both odd-frequency ($ω$) spin-singlet and spin-triplet pair amp...

[Phys. Rev. B 96, 174509] Published Wed Nov 15, 2017

Anisotropic multichain nature and filamentary superconductivity in the charge density wave system ${\mathrm{HfTe}}_{3}$


Author(s): Jing Li, Jian Peng, Shuai Zhang, and Genfu Chen

Single crystals of ${\mathrm{HfTe}}_{3}$ were successfully grown using a chemical transport reaction in an extremely narrow temperature range. Here, we report a comparative study of polycrystalline and single-crystal samples. The electrical resistivity $ρ(T)$ measured on polycrystalline samples show...

[Phys. Rev. B 96, 174510] Published Wed Nov 15, 2017

Type of dike using C-shaped vertical cylinders


Author(s): Guillaume Dupont, Fabien Remy, Olivier Kimmoun, Bernard Molin, Sebastien Guenneau, and Stefan Enoch

The present study investigates a way to design dikes which can filter the wavelengths of ocean surface waves. This offers the possibility to achieve a structure that can attenuate waves associated with storm swell, without affecting coastline in other conditions. Our approach is based on low-frequen...

[Phys. Rev. B 96, 180302(R)] Published Wed Nov 15, 2017

Striped magnetic ground state of the kagome lattice in ${\mathrm{Fe}}_{4}{\mathrm{Si}}_{2}{\mathrm{Sn}}_{7}{\mathrm{O}}_{16}$


Author(s): C. D. Ling, M. C. Allison, S. Schmid, M. Avdeev, J. S. Gardner, C.-W. Wang, D. H. Ryan, M. Zbiri, and T. Söhnel

We have experimentally identified a different magnetic ground state for the kagome lattice, in the perfectly hexagonal ${\mathrm{Fe}}^{2+}$ ($3{d}^{6},\phantom{\rule{0.16em}{0ex}}S=2$) compound ${\mathrm{Fe}}_{4}{\mathrm{Si}}_{2}{\mathrm{Sn}}_{7}{\mathrm{O}}_{16}$. A representational symmetry analys...

[Phys. Rev. B 96, 180410(R)] Published Wed Nov 15, 2017

Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric $0.964{\mathrm{Na}}_{1/2}{\mathrm{Bi}}_{1/2}{\mathrm{TiO}}_{3}−0.036{\mathrm{BaTiO}}_{3}$


Author(s): Florian Pforr, Kai-Christian Meyer, Márton Major, Karsten Albe, Wolfgang Donner, Uwe Stuhr, and Alexandre Ivanov

The local dynamics of the lead-free relaxor $0.964{\mathrm{Na}}_{1/2}{\mathrm{Bi}}_{1/2}{\mathrm{TiO}}_{3}−0.036{\mathrm{BaTiO}}_{3}$ (NBT-3.6BT) have been investigated by a combination of quasielastic neutron-scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we we...

[Phys. Rev. B 96, 184107] Published Wed Nov 15, 2017

Dimensional reduction and its breakdown in the driven random-field $\mathbf{O}(N)$ model


Author(s): Taiki Haga

The critical behavior of a random-field $\mathbf{O}(N)$ model driven at a uniform velocity is investigated near three dimensions at zero temperature. From intuitive arguments, we predict that the large-scale behavior of the $D$-dimensional driven random-field $\mathbf{O}(N)$ model is identical to th...

[Phys. Rev. B 96, 184202] Published Wed Nov 15, 2017

Förster-type triplet-polaron quenching in disordered organic semiconductors


Author(s): R. Coehoorn, P. A. Bobbert, and H. van Eersel

Triplet-polaron quenching (TPQ) is a major cause of the efficiency loss at large current densities in phosphorescent organic light-emitting diodes. The nature of the interaction process is presently not well understood. In this paper, we study TPQ due to Förster-type triplet-polaron interactions in ...

[Phys. Rev. B 96, 184203] Published Wed Nov 15, 2017

Strong coupling of phononic cavity modes in one-dimensional corrugated nanobeam structures


Author(s): A. V. Korovin, Y. Pennec, and B. Djafari-Rouhani

The interaction of phononic cavities modes in one-dimensional nanobeam-based structures is investigated theoretically. The overlapping of two closely spaced phononic cavity modes leads to the formation of symmetric and antisymmetric modes, which can be used for the modulation of the frequency and th...

[Phys. Rev. B 96, 184302] Published Wed Nov 15, 2017

Spin-density fluctuations and the fluctuation-dissipation theorem in $3d$ ferromagnetic metals


Author(s): A. L. Wysocki, V. N. Valmispild, A. Kutepov, S. Sharma, J. K. Dewhurst, E. K. U. Gross, A. I. Lichtenstein, and V. P. Antropov

Spatial and time scales of spin-density fluctuations (SDFs) were analyzed in $3d$ ferromagnets using ab initio linear-response calculations of complete wave-vector and energy dependence of the dynamic spin susceptibility tensor. We demonstrate that SDFs are spread continuously over the entire Brillo...

[Phys. Rev. B 96, 184418] Published Wed Nov 15, 2017

Magnetic phase diagram for the mixed-valence Eu oxide ${\mathrm{EuTi}}_{1−x}{\mathrm{Al}}_{x}{\mathrm{O}}_{3}$ $(0≤x≤1)$


Author(s): Daisuke Akahoshi, Shuto Koshikawa, Takuro Nagase, Eiji Wada, Kosuke Nishina, Ryo Kajihara, Hideki Kuwahara, and Toshiaki Saito

We have investigated the magnetic properties of ${\mathrm{EuTi}}_{1−x}{\mathrm{Al}}_{x}{\mathrm{O}}_{3}$ with $0≤x≤1$ and established a detailed magnetic phase diagram. Substitution of ${\mathrm{Ti}}^{4+}$ with ${\mathrm{Al}}^{3+}$, which oxidizes magnetic ${\mathrm{Eu}}^{2+}$ $(J=7/2)$ into nonmagn...

[Phys. Rev. B 96, 184419] Published Wed Nov 15, 2017

Superconductivity of barium-VI synthesized via compression at low temperatures


Author(s): D. E. Jackson, D. VanGennep, Y. K. Vohra, S. T. Weir, and J. J. Hamlin

Using a membrane-driven diamond anvil cell and both ac magnetic susceptibility and electrical resistivity measurements, we have characterized the superconducting phase diagram of elemental barium to pressures as high as 65 GPa. We have determined the superconducting properties of the recently discov...

[Phys. Rev. B 96, 184514] Published Wed Nov 15, 2017

Gapless excitations in the ground state of $1T\text{−}{\mathrm{TaS}}_{2}$


Author(s): A. Ribak, I. Silber, C. Baines, K. Chashka, Z. Salman, Y. Dagan, and A. Kanigel

$1T\text{−}{\mathrm{TaS}}_{2}$ is a layered transition-metal dichalcogenide with a very rich phase diagram. At $T=180$ K it undergoes a metal to Mott insulator transition. Mott insulators usually display antiferromagnetic ordering in the insulating phase but $1T\text{−}{\mathrm{TaS}}_{2}$ was never ...

[Phys. Rev. B 96, 195131] Published Wed Nov 15, 2017

Light tunneling anomaly in interlaced metallic wire meshes


Author(s): Hafssaa Latioui and Mário G. Silveirinha

For long wavelengths, three-dimensional connected metallic wire meshes are impenetrable by light and have an electromagnetic response similar to that of an electron gas below the plasma frequency. Surprisingly, here it is shown that when two opaque metallic meshes are spatially interlaced, the combi...

[Phys. Rev. B 96, 195132] Published Wed Nov 15, 2017

Generalization of Bloch's theorem for arbitrary boundary conditions: Theory


Author(s): Abhijeet Alase, Emilio Cobanera, Gerardo Ortiz, and Lorenza Viola

Can one steer a material by its surface? A generalization of Bloch’s theorem to arbitrary boundary conditions reveals actionable links going from surface physics towards changing overall electronic properties. Furthermore, it predicts the existence, in short-range systems, of topological zero-energy modes with power-law corrections, and answers basic questions about system sizes, for which bulk and surface properties merge. The theorem yields exact inversion-free diagonalization algorithms, potentially of interest for large-scale band-structure calculations, by leveraging two new constructs: the analytic continuation of the Bloch Hamiltonian off the Brillouin zone and the boundary matrix that efficiently encodes the interplay between bulk and boundary conditions.

[Phys. Rev. B 96, 195133] Published Wed Nov 15, 2017

Topological magnon bound states in periodically modulated Heisenberg XXZ chains


Author(s): Xizhou Qin (秦锡洲), Feng Mei (梅锋), Yongguan Ke (柯勇贯), Li Zhang (张莉), and Chaohong Lee (李朝红)

Strongly interacting topological states in multiparticle quantum systems pose great challenges to both theory and experiment. Recently, bound states of elementary spin waves (magnons) in quantum magnets have been experimentally observed in quantum Heisenberg chains comprising ultracold Bose atoms in...

[Phys. Rev. B 96, 195134] Published Wed Nov 15, 2017

Second quantization of Leinaas-Myrheim anyons in one dimension and their relation to the Lieb-Liniger model


Author(s): Thore Posske, Björn Trauzettel, and Michael Thorwart

In one spatial dimension, anyons in the original description of Leinaas and Myrheim are formally equivalent to locally interacting bosons described by the Lieb-Liniger model. This allows an interesting reinterpretation of interacting bosons in the context of anyons. We elaborate on this parallel, pa...

[Phys. Rev. B 96, 195422] Published Wed Nov 15, 2017

Manipulating quantum Hall edge channels in graphene through scanning gate microscopy


Author(s): Lennart Bours, Stefano Guiducci, Alina Mreńca-Kolasińska, Bartłomiej Szafran, Jan C. Maan, and Stefan Heun

We show evidence of the backscattering of quantum Hall edge channels in a narrow graphene Hall bar, induced by the gating effect of the conducting tip of a scanning gate microscope, which we can position with nanometer precision. We show full control over the edge channels and are able, because of t...

[Phys. Rev. B 96, 195423] Published Wed Nov 15, 2017

Generic nearest-neighbor kagome model: XYZ and Dzyaloshinskii-Moriya couplings with comparison to the pyrochlore-lattice case


Author(s): Karim Essafi, Owen Benton, and L. D. C. Jaubert

The kagome lattice is a paragon of geometrical frustration, long-studied for its association with novel ground states including spin liquids. Many recently synthesized kagome materials feature rare-earth ions, which may be expected to exhibit highly anisotropic exchange interactions. The consequence...

[Phys. Rev. B 96, 205126] Published Wed Nov 15, 2017

Topological edge-state engineering with high-frequency electromagnetic radiation


Author(s): Mehedi Hasan, Dmitry Yudin, Ivan Iorsh, Olle Eriksson, and Ivan Shelykh

Strong interaction with light may modify quantitatively the electronic properties of condensed matter systems. Here, the authors consider the classical example of topological electron states in a CdTe/HgTe/CdTe heterostructure and demonstrate that the coupling between electrons in a two-dimensional region and an external electromagnetic wave controls with high accuracy the normal and topological phases in the system. The electromagnetic radiation also modifies the properties of the edge states, which leads to the reversal of the edge spin currents. Importantly, all these effects can be realized in controllable and reversible way, and this has high potential impact for their integration of spintronics and optoelectronics.

[Phys. Rev. B 96, 205127] Published Wed Nov 15, 2017

Orbital-based charge self-consistent Blackman-Esterling-Berk coherent potential approximation approach to substitutional disorder within a pseudopotential framework


Author(s): Alexander Herbig, Rolf Heid, and Robert Eder

We report the development of an ab initio electronic structure method applicable to generic substitutionally disordered real materials. A charge self-consistent orbital-based extension of the coherent potential approximation due to Blackman, Esterling, and Berk (BEB-CPA) is combined with the mixed-b...

[Phys. Rev. B 96, 205128] Published Wed Nov 15, 2017

Experimental evidence for topological surface states wrapping around a bulk SnTe crystal


Author(s): K. Dybko, M. Szot, A. Szczerbakow, M. U. Gutowska, T. Zajarniuk, J. Z. Domagala, A. Szewczyk, T. Story, and W. Zawadzki

We demonstrate that the metallic topological surface states wrap on all sides the three-dimensional topological crystalline insulator SnTe. This is achieved by studying oscillatory quantum magnetotransport and magnetization at tilted magnetic fields, which enables us to observe simultaneous contribu...

[Phys. Rev. B 96, 205129] Published Wed Nov 15, 2017

Ground-state phase diagram of the triangular lattice Hubbard model by the density-matrix renormalization group method


Author(s): Tomonori Shirakawa, Takami Tohyama, Jure Kokalj, Sigetoshi Sota, and Seiji Yunoki

Two-dimensional density-matrix renormalization group method is employed to examine the ground-state phase diagram of the Hubbard model on the triangular lattice at half-filling. The calculation reveals two discontinuities in the double occupancy with increasing the repulsive Hubbard interaction $U$ ...

[Phys. Rev. B 96, 205130] Published Wed Nov 15, 2017

Length-dependent lattice thermal conductivity of single-layer and multilayer hexagonal boron nitride: A first-principles study using the Callaway-Klemens and real-space supercell methods


Author(s): Ransell D'Souza and Sugata Mukherjee

The phonon dispersion, density of states, Grüneisen parameters, and the lattice thermal conductivity of single-layer and multilayer boron nitride were calculated using first-principles methods. For the bulk $h$-BN we also report the two-phonon density of states. We also present simple analytical sol...

[Phys. Rev. B 96, 205422] Published Wed Nov 15, 2017

Nature of carrier injection in metal/2D-semiconductor interface and its implications for the limits of contact resistance


Author(s): Divya Somvanshi, Sangeeth Kallatt, Chenniappan Venkatesh, Smitha Nair, Garima Gupta, John Kiran Anthony, Debjani Karmakar, and Kausik Majumdar

Monolayers of transition metal dichalcogenides (TMDCs) exhibit excellent electronic and optical properties. However, the performance of these two-dimensional (2D) devices are often limited by the large resistance offered by the metal contact interface. To date, the carrier injection mechanism from m...

[Phys. Rev. B 96, 205423] Published Wed Nov 15, 2017

Theory of electron spin resonance in one-dimensional topological insulators with spin-orbit couplings: Detection of edge states


Author(s): Yuan Yao, Masahiro Sato, Tetsuya Nakamura, Nobuo Furukawa, and Masaki Oshikawa

Edge/surface states often appear in a topologically nontrivial phase when the system has a boundary. The edge state of a one-dimensional topological insulator is one of the simplest examples. Electron spin resonance (ESR) is an ideal probe to detect and analyze the edge state for its high sensitivit...

[Phys. Rev. B 96, 205424] Published Wed Nov 15, 2017

Magnon-phonon relaxation in yttrium iron garnet from first principles


Author(s): Yi Liu, Li-Shan Xie, Zhe Yuan, and Ke Xia

We combine the theoretical method of calculating spin wave excitation with the finite-temperature modeling of lattice vibration and calculate the magnon-phonon relaxation time in the technologically important material yttrium iron garnet (YIG) from first principles. The finite lifetime of magnon exc...

[Phys. Rev. B 96, 174416] Published Tue Nov 14, 2017

Emergence and magnetic-field variation of chiral-soliton lattice and skyrmion lattice in the strained helimagnet ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$


Author(s): Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. Tokura

We demonstrate emergence of both the chiral soliton lattice and skyrmion lattice and investigate their magnetic-field variation in the strained ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ thin plate by means of small-angle resonant soft x-ray scattering. The tensile strain stabilizes a helical spin struc...

[Phys. Rev. B 96, 174417] Published Tue Nov 14, 2017

Structural and magnetic short-range order in fluorite ${\mathrm{Yb}}_{2}{\mathrm{TiO}}_{5}$


Author(s): Jacob Shamblin, Zhiling Dun, Minseong Lee, Steve Johnston, Eun Sang Choi, Katharine Page, Yiming Qiu, and Haidong Zhou

We studied structural and magnetic ordering in ${\mathrm{Yb}}_{2}{\mathrm{TiO}}_{5}$ using synchrotron x-ray diffraction, neutron diffraction and total scattering, ac and dc susceptibility, and inelastic neutron scattering. Diffraction measurements reveal an average disordered fluorite structure wit...

[Phys. Rev. B 96, 174418] Published Tue Nov 14, 2017

Magnetism and superconductivity in the layered hexagonal transition metal pnictides


Author(s): Jinfeng Zeng, Shengshan Qin, Congcong Le, and Jiangping Hu

We investigate the electronic and magnetic structures of the $122({AM}_{2}{B}_{2})$ hexagonal transition metal pnictides with $A=(\text{Sr},\text{Ca}),M=(\text{Cr},\text{Mn},\text{Fe},\text{Co},\text{Ni})$, and $B=(\text{As},\text{P},\text{Sb})$. It is found that the family of materials shares criti...

[Phys. Rev. B 96, 174506] Published Tue Nov 14, 2017

Anisotropy and multiband superconductivity in ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ determined by small-angle neutron scattering studies of the vortex lattice


Author(s): S. J. Kuhn, W. Morgenlander, E. R. Louden, C. Rastovski, W. J. Gannon, H. Takatsu, D. C. Peets, Y. Maeno, C. D. Dewhurst, J. Gavilano, and M. R. Eskildsen

Despite numerous studies the exact nature of the order parameter in superconducting ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with ...

[Phys. Rev. B 96, 174507] Published Tue Nov 14, 2017

Piezomagnetoelectric effect in ${\mathrm{LiCoPO}}_{4}$


Author(s): V. D. Fil, M. P. Kolodyazhnaya, G. A. Zvyagina, I. V. Bilych, and K. R. Zhekov

The piezomagnetoelectric effect is considered to be the appearance of a piezoelectric response caused by a magnetic field in magnetically ordered media. The possibility of its existence in antiferromagnets was predicted in the 1960's; however, attempts at its experimental detection were unsuccessful...

[Phys. Rev. B 96, 180407(R)] Published Tue Nov 14, 2017

Spin-orbit coupling fluctuations as a mechanism of spin decoherence


Author(s): M. Martens, G. Franco, N. S. Dalal, S. Bertaina, and I. Chiorescu

We discuss a general framework to address spin decoherence resulting from fluctuations in a spin Hamiltonian. We performed a systematic study on spin decoherence in the compound ${\mathrm{K}}_{6}[{\mathrm{V}}_{15}{\mathrm{As}}_{6}{\mathrm{O}}_{42}({\mathrm{D}}_{2}\mathrm{O})]\phantom{\rule{0.16em}{0...

[Phys. Rev. B 96, 180408(R)] Published Tue Nov 14, 2017

Gapless magnetic excitations in the kagome antiferromagnet Ca-kapellasite probed by $^{35}\mathrm{Cl}$ NMR spectroscopy


Author(s): Y. Ihara, T. Sasaki, N. Noguchi, Y. Ishii, M. Oda, and H. Yoshida

The low-energy magnetic excitations of the spin-$1/2$ kagome antiferromagnet ${\mathrm{CaCu}}_{3}{(\mathrm{OH})}_{6}{\mathrm{Cl}}_{2}·0.6{\mathrm{H}}_{2}\mathrm{O}$ (Ca-kapellasite) have been investigated by a $^{35}\mathrm{Cl}$ NMR experiment in fields up to 18.9 T. Recently, Ca-kapellasite was fou...

[Phys. Rev. B 96, 180409(R)] Published Tue Nov 14, 2017

Number of thermodynamic states in the three-dimensional Edwards-Anderson spin glass


Author(s): Wenlong Wang, Jonathan Machta, Humberto Munoz-Bauza, and Helmut G. Katzgraber

The question of the number of thermodynamic states present in the low-temperature phase of the three-dimensional Edwards-Anderson Ising spin glass is addressed by studying spin- and link-overlap distributions using population annealing Monte Carlo simulations. We consider overlaps between systems wi...

[Phys. Rev. B 96, 184417] Published Tue Nov 14, 2017

Doping evolution of the anisotropic upper critical fields in the iron-based superconductor ${\mathrm{Ba}}_{1−x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$


Author(s): M. A. Tanatar, Yong Liu, J. Jaroszynski, J. S. Brooks, T. A. Lograsso, and R. Prozorov

In-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic $ac$ plane were used to study the upper critical field ${H}_{c2}$ of the hole-doped iron-based superconductor ${\mathrm{Ba}}_{1−x}{\mathrm{K}}_{x}{\mathrm...

[Phys. Rev. B 96, 184511] Published Tue Nov 14, 2017

Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${\mathrm{NaFe}}_{0.9785}{\mathrm{Co}}_{0.0215}\mathrm{As}$


Author(s): Yu Song, Weiyi Wang, Chenglin Zhang, Yanhong Gu, Xingye Lu, Guotai Tan, Yixi Su, Frédéric Bourdarot, A. D. Christianson, Shiliang Li, and Pengcheng Dai

We use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${\mathrm{NaFe}}_{0.9785}{\mathrm{Co}}_{0.0215}\mathrm{As}$, with coexisting superconductivity $({T}_{\mathrm{c}}≈19$ K) and weak ant...

[Phys. Rev. B 96, 184512] Published Tue Nov 14, 2017

Possible high-${T}_{c}$ superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds


Author(s): Daisuke Ogura, Hideo Aoki, and Kazuhiko Kuroki

We introduce the concept of “hidden ladders” for the bilayer Ruddlesden-Popper-type compounds: While the crystal structure is bilayer, ${d}_{xz}$ (${d}_{yz}$) orbitals in the relevant ${t}_{2g}$ sector of the transition metal form a two-leg ladder along $x$ ($y$) since the ${d}_{xz}$ (${d}_{yz}$) el...

[Phys. Rev. B 96, 184513] Published Tue Nov 14, 2017

Emergent Bloch excitations in Mott matter


Author(s): Nicola Lanatà, Tsung-Han Lee, Yong-Xin Yao, and Vladimir Dobrosavljević

We develop a unified theoretical picture for excitations in Mott systems, portraying both the heavy quasiparticle excitations and the Hubbard bands as features of an emergent Fermi liquid state formed in an extended Hilbert space, which is nonperturbatively connected to the physical system. This obs...

[Phys. Rev. B 96, 195126] Published Tue Nov 14, 2017

Defects between gapped boundaries in two-dimensional topological phases of matter


Author(s): Iris Cong, Meng Cheng, and Zhenghan Wang

Defects between gapped boundaries provide a possible physical realization of projective non-Abelian braid statistics. A notable example is the projective Majorana/parafermion braid statistics of boundary defects in fractional quantum Hall/topological insulator and superconductor heterostructures. In...

[Phys. Rev. B 96, 195129] Published Tue Nov 14, 2017

Giant magnetoelectric effect in pure manganite-manganite heterostructures


Author(s): Sanjukta Paul, Ravindra Pankaj, Sudhakar Yarlagadda, Pinaki Majumdar, and Peter B. Littlewood

Obtaining strong magnetoelectric couplings in bulk materials and heterostructures is an ongoing challenge. We demonstrate that manganite heterostructures of the form (Insulator) $/{({\mathrm{LaMnO}}_{3})}_{\mathrm{n}}/\mathrm{Interface}/{({\mathrm{CaMnO}}_{3})}_{\mathrm{n}}/(\mathrm{Insulator})$ sho...

[Phys. Rev. B 96, 195130] Published Tue Nov 14, 2017

${\mathbb{Z}}_{4}$ parafermions in an interacting quantum spin Hall Josephson junction coupled to an impurity spin


Author(s): Yuval Vinkler-Aviv, Piet W. Brouwer, and Felix von Oppen

${\mathbb{Z}}_{4}$ parafermions can be realized in a strongly interacting quantum spin Hall Josephson junction or in a spin Hall Josephson junction strongly coupled to an impurity spin. In this paper, we study a system that has both features, but with weak (repulsive) interactions and a weakly coupl...

[Phys. Rev. B 96, 195421] Published Tue Nov 14, 2017

Observation of an emergent coherent state in the iron-based superconductor ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$


Author(s): Run Yang, Zhiping Yin, Yilin Wang, Yaomin Dai, Hu Miao, Bing Xu, Xianggang Qiu, and Christopher C. Homes

The $\mathit{ab}$-plane optical properties of ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$ single crystals have been measured over a wide temperature and frequency range. Below ${T}^{*}≃155$ K, where this material undergoes an incoherent-coherent crossover, a new coherent response emerges in the optical co...

[Phys. Rev. B 96, 201108(R)] Published Tue Nov 14, 2017

Experimentally accessible topological quality factor for wires with zero energy modes


Author(s): David J. Clarke

Spin-orbit coupled semiconducting nanowires with proximity-induced superconductivity are expected to host Majorana zero modes at their endpoints when a sufficiently strong magnetic field is applied. The resulting phase would be a one-dimensional topological superconductor. However, while a variety o...

[Phys. Rev. B 96, 201109(R)] Published Tue Nov 14, 2017

Quantum quench of the Sachdev-Ye-Kitaev model


Author(s): Andreas Eberlein, Valentin Kasper, Subir Sachdev, and Julia Steinberg

We describe the nonequilibrium quench dynamics of the Sachdev-Ye-Kitaev models of fermions with random all-to-all interactions. These provide tractable models of the dynamics of quantum systems without quasiparticle excitations. The Kadanoff-Baym equations show that, at long times, the fermion two-p...

[Phys. Rev. B 96, 205123] Published Tue Nov 14, 2017

Stability of the spin-$\frac{1}{2}$ kagome ground state with breathing anisotropy


Author(s): Cécile Repellin, Yin-Chen He, and Frank Pollmann

We numerically study the spin-$\frac{1}{2}$ breathing kagome lattice. In this variation of the kagome Heisenberg antiferromagnet, the spins belonging to upward and downward facing triangles have different coupling strengths. Using the density matrix renormalization group (DMRG) method and exact diag...

[Phys. Rev. B 96, 205124] Published Tue Nov 14, 2017

Bulk and in-gap states in ${\mathrm{SmB}}_{6}$ revealed by high-field magnetotransport


Author(s): M. Shahrokhvand, S. Pezzini, M. R. van Delft, U. Zeitler, N. E. Hussey, and S. Wiedmann

We report on temperature-dependent magnetotransport experiments of ${\mathrm{SmB}}_{6}$ single crystals in high magnetic fields up to 33 T. Above the low-temperature plateau region in the zero-field resistivity, we find two distinct gapped regimes. The first is characterized by a temperature-indepen...

[Phys. Rev. B 96, 205125] Published Tue Nov 14, 2017

Role of defects in enhanced Fermi level pinning at interfaces between metals and transition metal dichalcogenides


Author(s): Le Huang, Lin Tao, Kai Gong, Yongtao Li, Huafeng Dong, Zhongming Wei, and Jingbo Li

Density functional theory calculations are performed to explore the nature of the contact between metal electrodes and defected monolayer ${\mathrm{MoSe}}_{2}$. Partial Fermi level pinning is observed at perfect ${\mathrm{MoSe}}_{2}$/metal interfaces. Both As- and Br-substituted ${\mathrm{MoSe}}_{2}...

[Phys. Rev. B 96, 205303] Published Tue Nov 14, 2017

Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures


Author(s): Chad A. McCoy, Marcus D. Knudson, and Seth Root

Measurement of the Hugoniot and sound velocity provides information on the bulk modulus and Grüneisen parameter of a material at extreme conditions. The capability to launch multilayered (copper/aluminum) flyer plates at velocities in excess of 20 km/s with the Sandia Z accelerator has enabled high-...

[Phys. Rev. B 96, 174109] Published Mon Nov 13, 2017

Electronic properties of disordered Weyl semimetals at charge neutrality


Author(s): Tobias Holder, Chia-Wei Huang, and Pavel M. Ostrovsky

Weyl semimetals are bulk materials with extreme spin-orbit coupling giving rise to gapless Dirac-like excitations. They exhibit a number of peculiar electronic properties owing to the topological nature of the spectrum. While weak disorder is known to be irrelevant in Weyl semimetals, recent theoretical studies have suggested that scattering from rare regions can give rise to a finite density of states at charge neutrality. The authors present a self-consistent theory, taking into account coherent scattering on multiple resonant impurities. The theory predicts relatively high density of states and conductivity at the Weyl point with a nonanalytic dependence on the impurity concentration.

[Phys. Rev. B 96, 174205] Published Mon Nov 13, 2017

Elastic properties of paramagnetic austenitic steel at finite temperature: Longitudinal spin fluctuations in multicomponent alloys


Author(s): Zhihua Dong, Stephan Schönecker, Dengfu Chen, Wei Li, Mujun Long, and Levente Vitos

We propose a first-principles framework for longitudinal spin fluctuations (LSFs) in disordered paramagnetic (PM) multicomponent alloy systems and apply it to investigate the influence of LSFs on the temperature dependence of two elastic constants of PM austenitic stainless steel Fe15Cr15Ni. The mag...

[Phys. Rev. B 96, 174415] Published Mon Nov 13, 2017

Nonperturbative renormalization group treatment of amplitude fluctuations for ${|\mathbf{φ}|}^{\mathbit{4}}$ topological phase transitions


Author(s): Nicolò Defenu, Andrea Trombettoni, István Nándori, and Tilman Enss

The study of the Berezinskii-Kosterlitz-Thouless transition in two-dimensional ${|φ|}^{4}$ models can be performed in several representations, and the amplitude-phase (AP) Madelung parametrization is a natural way to study the contribution of density fluctuations to nonuniversal quantities. We intro...

[Phys. Rev. B 96, 174505] Published Mon Nov 13, 2017

Magnetic dimerization in the frustrated spin ladder ${\mathrm{Li}}_{2}{\mathrm{Cu}}_{2}\mathrm{O}{({\mathrm{SO}}_{4})}_{2}$


Author(s): O. Vaccarelli, G. Rousse, A. Saúl, and G. Radtke

The magnetic properties of ${\mathrm{Li}}_{2}{\mathrm{Cu}}_{2}\mathrm{O}{({\mathrm{SO}}_{4})}_{2}$ are investigated in the framework of density functional theory. In its high-temperature tetragonal structure, this compound appears as a rare material realization of a frustrated spin-1/2 two-leg ladde...

[Phys. Rev. B 96, 180406(R)] Published Mon Nov 13, 2017

NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure


Author(s): P. Wiecki, M. Nandi, A. E. Böhmer, S. L. Bud'ko, P. C. Canfield, and Y. Furukawa

We present $^{77}\mathrm{Se}$-NMR measurements on single-crystalline FeSe under pressures up to 2 GPa. Based on the observation of the splitting and broadening of the NMR spectrum due to structural twin domains, we discovered that static, local nematic ordering exists well above the bulk nematic ord...

[Phys. Rev. B 96, 180502(R)] Published Mon Nov 13, 2017

Thermodynamic limits for optomechanical systems with conservative potentials


Author(s): Stephen Ragole, Haitan Xu, John Lawall, and Jacob M. Taylor

The mechanical force from light—radiation pressure—provides an intrinsically nonlinear interaction. Consequently, optomechanical systems near their steady state, such as the canonical optical spring, can display nonanalytic behavior as a function of external parameters. This nonanalyticity, a key fe...

[Phys. Rev. B 96, 184106] Published Mon Nov 13, 2017

Dynamic pathway of the photoinduced phase transition of ${\mathrm{TbMnO}}_{3}$


Author(s): Elisabeth M. Bothschafter, Elsa Abreu, Laurenz Rettig, Teresa Kubacka, Sergii Parchenko, Michael Porer, Christian Dornes, Yoav William Windsor, Mahesh Ramakrishnan, Aurora Alberca, Sebastian Manz, Jonathan Saari, Seyed M. Koohpayeh, Manfred Fiebig, Thomas Forrest, Philipp Werner, Sarnjeet S. Dhesi, Steven L. Johnson, and Urs Staub

We investigate the demagnetization dynamics of the cycloidal and sinusoidal phases of multiferroic ${\mathrm{TbMnO}}_{3}$ by means of time-resolved resonant soft x-ray diffraction following excitation by an optical pump. The use of orthogonal linear x-ray polarizations provides information on the co...

[Phys. Rev. B 96, 184414] Published Mon Nov 13, 2017

Systematic investigations of transient response of nuclear spins in the presence of polarized electrons


Author(s): Mohmoud Rasly, Zhichao Lin, and Tetsuya Uemura

We electrically probed the transient response of nuclear spins in an $n$-GaAs channel by performing Hanle signal and spin-valve signal measurements on an all-electrical spin-injection device having a half-metallic spin source of $\mathrm{C}{\mathrm{o}}_{2}\mathrm{MnSi}$. Furthermore, we simulated th...

[Phys. Rev. B 96, 184415] Published Mon Nov 13, 2017