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Preview: Recent Articles in Phys. Rev. B

Recent Articles in Phys. Rev. B



Recent articles in Physical Review B



Published: 2017-04-21T14:59:37-04:00

 



Shear banding in metallic glasses described by alignments of Eshelby quadrupoles

2017-04-21T10:00:00-04:00

Author(s): Vitalij Hieronymus-Schmidt, Harald Rösner, Gerhard Wilde, and Alessio Zaccone
Plastic deformation of metallic glasses performed well below the glass transition temperature leads to the formation of shear bands as a result of shear localization. It is believed that shear banding originates from individual stress concentrators having quadrupolar symmetry. To elucidate the under…
[Phys. Rev. B 95, 134111] Published Fri Apr 21, 2017



Typical-medium multiple-scattering theory for disordered systems with Anderson localization

2017-04-21T10:00:00-04:00

Author(s): H. Terletska, Y. Zhang, L. Chioncel, D. Vollhardt, and M. Jarrell
The typical medium dynamical cluster approximation (TMDCA) is reformulated in the language of multiple scattering theory to make possible first-principles calculations of the electronic structure of substitutionally disordered alloys including the effect of Anderson localization. The TMDCA allows fo…
[Phys. Rev. B 95, 134204] Published Fri Apr 21, 2017



Universal Berezinskii-Kosterlitz-Thouless dynamic scaling in the intermediate time range in frustrated Heisenberg antiferromagnets on a triangular lattice

2017-04-21T10:00:00-04:00

Author(s): Ivan S. Popov, Pavel V. Prudnikov, Andrey N. Ignatenko, and Andrey A. Katanin
We investigate nonequilibrium properties of the frustrated Heisenberg antiferromagnets on the triangular lattice. Nonequilibrium critical relaxation of frustrated Heisenberg antiferromagnets shows a dynamic transition (or, at least, sharp crossover) near the temperature T_{u}=0.282J of the equilibri…
[Phys. Rev. B 95, 134437] Published Fri Apr 21, 2017



Calculation of two-particle quantities in the typical medium dynamical cluster approximation

2017-04-21T10:00:00-04:00

Author(s): Y. Zhang, Y. F. Zhang, S. X. Yang, K.-M. Tam, N. S. Vidhyadhiraja, and M. Jarrell
The mean-field theory for disordered electron systems without interaction is widely and successfully used to describe equilibrium properties of materials over the whole range of disorder strengths. However, it fails to take into account the effects of quantum coherence and information of localizatio…
[Phys. Rev. B 95, 144208] Published Fri Apr 21, 2017



Tuning the competing phases of bilayer ruthenate Ca_{3} Ru_{2} O_{7} via dilute Mn impurities and magnetic field

2017-04-21T10:00:00-04:00

Author(s): M. Zhu, J. Peng, W. Tian, T. Hong, Z. Q. Mao, and X. Ke
We have systematically investigated the evolution of the magnetic structure of the bilayer ruthenate Ca_{3}(Ru_{1−x}Mn_{x})_{2}O_{7} induced upon Mn doping. For 0
[Phys. Rev. B 95, 144426] Published Fri Apr 21, 2017



Kitaev-Heisenberg model in a magnetic field: Order-by-disorder and commensurate-incommensurate transitions

2017-04-21T10:00:00-04:00

Author(s): Gia-Wei Chern, Yuriy Sizyuk, Craig Price, and Natalia B. Perkins
We present a theoretical study of field-induced magnetic phases in the honeycomb Kitaev-Heisenberg model, which is believed to describe the essential physics of Mott insulators with strong spin-orbit coupling such as A_{2}IrO_{3} and α−RuCl_{3}. We obtain a rich finite temperature phase diagram in w…
[Phys. Rev. B 95, 144427] Published Fri Apr 21, 2017



Massive spinons in S=1/2 spin chains: Spinon-pair operator representation

2017-04-21T10:00:00-04:00

Author(s): Mohsen Hafez-Torbati and Götz S. Uhrig
Spinons are among the generic excitations in one-dimensional spin systems; they can be massless or massive. The quantitative description of massive spinons poses a considerable challenge in spite of various variational approaches. We show that a representation in terms of hopping and Bogoliubov spin…
[Phys. Rev. B 95, 155136] Published Fri Apr 21, 2017



Understanding magnetic focusing in graphene p−n junctions through quantum modeling

2017-04-21T10:00:00-04:00

Author(s): Samuel W. LaGasse and Ji Ung Lee
We present a quantum model which provides enhanced understanding of recent transverse magnetic focusing experiments on graphene p−n junctions. Spatially resolved flow maps of local particle current density show quantum interference and p−n junction filtering effects, which are crucial to explaining …
[Phys. Rev. B 95, 155433] Published Fri Apr 21, 2017



Electrostatically confined trilayer graphene quantum dots

2017-04-21T10:00:00-04:00

Author(s): M. Mirzakhani, M. Zarenia, P. Vasilopoulos, and F. M. Peeters
Electrically gating of trilayer graphene (TLG) opens a band gap offering the possibility to electrically engineer TLG quantum dots. We study the energy levels of such quantum dots and investigate their dependence on a perpendicular magnetic field B and different types of stacking of the graphene lay…
[Phys. Rev. B 95, 155434] Published Fri Apr 21, 2017



In-plane commensurate GaN/AlN junctions: Single-layer composite structures, single and multiple quantum wells and quantum dots

2017-04-21T10:00:00-04:00

Author(s): A. Onen, D. Kecik, E. Durgun, and S. Ciraci
In-plane composite structures constructed of the stripes or core/shells of single-layer GaN and AlN, which are joined commensurately, display a diversity of electronic properties that can be tuned by the size of their constituents. In heterostructures, the dimensionality of the electrons changes fro…
[Phys. Rev. B 95, 155435] Published Fri Apr 21, 2017



Non-Abelian ν=1/2 quantum Hall state in Γ_{8} valence band hole liquid

2017-04-21T10:00:00-04:00

Author(s): George Simion and Yuli Lyanda-Geller
In the search for states with non-Abelian statistics, we explore the fractional quantum Hall effect in a system of two-dimensional (2D) charge carrier holes. We propose a method of mapping states of holes confined to a finite width quantum well in a perpendicular magnetic field to states in a spheri…
[Phys. Rev. B 95, 161111(R)] Published Fri Apr 21, 2017



Search for composite fermions at filling factor 5/2: Role of Landau level and subband index

2017-04-21T10:00:00-04:00

Author(s): M. A. Mueed, D. Kamburov, Md. Shafayat Hossain, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan
The pairing of composite fermions (CFs), i.e., electron-flux quasiparticles, is commonly proposed to explain the even-denominator fractional quantum Hall state observed at ν=5/2 in the first excited (N=1) Landau level (LL) of a two-dimensional electron system (2DES). While well established to exist …
[Phys. Rev. B 95, 165438] Published Fri Apr 21, 2017



Spin-dependent thermoelectric phenomena in a quantum dot attached to ferromagnetic and superconducting electrodes

2017-04-21T10:00:00-04:00

Author(s): Piotr Trocha and Józef Barnaś
We investigate transport and thermoelectric properties of hybrid systems based on a single-level quantum dot and one superconducting lead. The other lead is generally normal-metallic ferromagnet. In the latter case, single-particle transport is spin polarized. Our main interest is in the interplay o…
[Phys. Rev. B 95, 165439] Published Fri Apr 21, 2017



Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an S=1 quantum antiferromagnet

2017-04-20T10:00:00-04:00

Author(s): Jamie Brambleby, Jamie L. Manson, Paul A. Goddard, Matthew B. Stone, Roger D. Johnson, Pascal Manuel, Jacqueline A. Villa, Craig M. Brown, Helen Lu, Shalinee Chikara, Vivien Zapf, Saul H. Lapidus, Rebecca Scatena, Piero Macchi, Yu-sheng Chen, Lai-Chin Wu, and John Singleton
The magnetic ground state of the quasi-one-dimensional spin-1 antiferromagnetic chain is sensitive to the relative sizes of the single-ion anisotropy (D) and the intrachain (J) and interchain (J^{′}) exchange interactions. The ratios D/J and J^{′}/J dictate the material's placement in one of three c…
[Phys. Rev. B 95, 134435] Published Thu Apr 20, 2017



Ising-like anisotropy stabilized 1/3 and 2/3 magnetization plateaus in the V^{3+} kagome lattice antiferromagnets Cs_{2} KV_{3} F_{12} ,Cs_{2} NaV_{3} F_{12} , and Rb_{2} NaV_{3} F_{12}

2017-04-20T10:00:00-04:00

Author(s): Masato Goto, Hiroaki Ueda, Chishiro Michioka, Akira Matsuo, Koichi Kindo, Kento Sugawara, Shintaro Kobayashi, Naoyuki Katayama, Hiroshi Sawa, and Kazuyoshi Yoshimura
We have investigated crystal structure and magnetic properties of three S=1V^{3+} Ising-like anisotropic kagome lattice antiferromagnets, Cs_{2}KV_{3}F_{12},Cs_{2}NaV_{3}F_{12}, and Rb_{2}NaV_{3}F_{12}, using single crystals. Each compound crystallizes in a monoclinic system and has a slightly disto…
[Phys. Rev. B 95, 134436] Published Thu Apr 20, 2017



Modulation of pairing symmetry with bond disorder in unconventional superconductors

2017-04-20T10:00:00-04:00

Author(s): Yao-Tai Kang, Wei-Feng Tsai, and Dao-Xin Yao
We study a two-orbital t−J_{1}−J_{2} model, originally developed to describe iron-based superconductors at low energies, in the presence of bond disorder (via next-nearest-neighbor J_{2}-bond dilution). By using the Bogoliubov–de Gennes approach, we self-consistently calculate the local pairing ampl…
[Phys. Rev. B 95, 134513] Published Thu Apr 20, 2017



^{3} P _{2} superfluids are topological

2017-04-20T10:00:00-04:00

Author(s): Takeshi Mizushima, Kota Masuda, and Muneto Nitta
We clarify the topology of ^{3}P_{2} superfluids which are expected to be realized in the inner cores of neutron stars and cubic odd-parity superconductors. ^{3}P_{2} phases include uniaxial/biaxial nematic phases and nonunitary ferromagnetic and cyclic phases. Here, we show that all the phases are …
[Phys. Rev. B 95, 140503(R)] Published Thu Apr 20, 2017



Effect of interactions and disorder on the relaxation of two-level systems in amorphous solids

2017-04-20T10:00:00-04:00

Author(s): Ofek Asban, Ariel Amir, Yoseph Imry, and Moshe Schechter
At low temperatures the dynamical degrees of freedom in amorphous solids are tunneling two-level systems (TLSs). Concentrating on these degrees of freedom, and taking into account disorder and TLS-TLS interactions, we obtain a “TLS glass,” described by the random-field Ising model with random 1/r^{3…
[Phys. Rev. B 95, 144207] Published Thu Apr 20, 2017



Bulklike excitations in nanoconfined liquid helium

2017-04-20T10:00:00-04:00

Author(s): M. S. Bryan, T. R. Prisk, T. E. Sherline, S. O. Diallo, and P. E. Sokol
The effects of confinement, disorder, and reduced dimensionality upon quantum fluids have been studied by the adsorption of liquid helium in porous media. The effects of extreme, nanoscale confinement upon its microscopic excitations are not presently understood. Several previous experiments have su…
[Phys. Rev. B 95, 144509] Published Thu Apr 20, 2017



Large-scale modulation in the superconducting properties of thin films due to domains in the SrTiO_{3} substrate

2017-04-20T10:00:00-04:00

Author(s): Shai Wissberg and Beena Kalisky
Scanning superconducting quantum interference device measurements reveal large-scale modulations of the superfluid density and the critical temperature in superconducting Nb, NbN, and underdoped YBa_{2}Cu_{3}O_{7−δ} films deposited on SrTiO_{3} (STO). We show that these modulations are a result of t…
[Phys. Rev. B 95, 144510] Published Thu Apr 20, 2017



Growth and electrical transport properties of La_{0.7} Sr_{0.3} MnO_{3} thin films on Sr_{2} IrO_{4} single crystals

2017-04-20T10:00:00-04:00

Author(s): E. J. Moon, A. F. May, P. Shafer, E. Arenholz, and S. J. May
We report the physical properties of La_{0.7}Sr_{0.3}MnO_{3} thin films on Sr_{2}IrO_{4} single crystals. The manganite films are deposited using oxide molecular beam epitaxy on flux-grown (001)-oriented iridate crystals. Temperature-dependent magnetotransport and x-ray magnetic circular dichroism m…
[Phys. Rev. B 95, 155135] Published Thu Apr 20, 2017



Impact of grain boundary characteristics on lattice thermal conductivity: A kinetic theory study on ZnO

2017-04-20T10:00:00-04:00

Author(s): Xin Liang
Grain boundaries are natural interfaces present in polycrystalline materials and have an important role in transport properties. In this work, the impact of grain boundary crystallographic mismatch, local impurity modulation, and spacing on lattice thermal conductivity is examined from the kinetic t…
[Phys. Rev. B 95, 155313] Published Thu Apr 20, 2017



Giant crystalline anisotropic magnetoresistance in nonmagnetic perovskite oxide heterostructures

2017-04-20T10:00:00-04:00

Author(s): H. J. Harsan Ma, J. Zhou, M. Yang, Y. Liu, S. W. Zeng, W. X. Zhou, L. C. Zhang, T. Venkatesan, Y. P. Feng, and Ariando
Anisotropic magnetoresistance (AMR) was observed by Lord Kelvin one-and-half centuries ago in iron and nickel. The resistance of these ferromagnetic conductors showed a few percent change when a magnetic field was applied along or across the current. Subsequently, a 20% AMR was demonstrated in alloy…
[Phys. Rev. B 95, 155314] Published Thu Apr 20, 2017



Heat conduction engineering in pillar-based phononic crystals

2017-04-20T10:00:00-04:00

Author(s): Roman Anufriev and Masahiro Nomura
Pillar-based phononic crystals belong to a class of acoustic metamaterials that can control heat conduction based on the design of the structure. In this work, we systematically investigate how various parameters of pillar-based phononic crystals affect thermal conductance at low temperatures. We fi…
[Phys. Rev. B 95, 155432] Published Thu Apr 20, 2017



Thermomechanical stabilization of electron small polarons in SrTiO_{3} assessed by the quasiharmonic approximation

2017-04-20T10:00:00-04:00

Author(s): Mostafa Youssef, Bilge Yildiz, and Krystyn J. Van Vliet
We predict a predominance diagram for electron defects in the temperature-hydrostatic stress space for SrTiO_{3} by combining density functional theory and the quasiharmonic approximation. We discovered two regimes where small polarons dominate: under tensile stress at lower temperature due to a lar…
[Phys. Rev. B 95, 161110(R)] Published Thu Apr 20, 2017



Real-space and plane-wave hybrid method for electronic structure calculations for two-dimensional materials

2017-04-20T10:00:00-04:00

Author(s): V. Nam Do, H. Anh Le, and V. Thieu Vu
We propose a computational approach to combining the plane-wave method and the real-space treatment to describe the periodic variation in the material plane and the decay of wave functions from the material surfaces. The proposed approach is natural for two-dimensional material systems and thus may …
[Phys. Rev. B 95, 165130] Published Thu Apr 20, 2017



Anisotropy, phonon modes, and lattice anharmonicity from dielectric function tensor analysis of monoclinic cadmium tungstate

2017-04-20T10:00:00-04:00

Author(s): A. Mock, R. Korlacki, S. Knight, and M. Schubert
We determine the frequency dependence of four independent Cartesian tensor elements of the dielectric function for CdWO_{4} using generalized spectroscopic ellipsometry within mid-infrared and far-infrared spectral regions. Different single crystal cuts, (010) and (001), are investigated. From the s…
[Phys. Rev. B 95, 165202] Published Thu Apr 20, 2017



Manipulating the polar mismatch at the LaNiO_{3} /SrTiO_{3} (111) interface

2017-04-20T10:00:00-04:00

Author(s): M. Saghayezhian, Zhen Wang, Hangwen Guo, Yimei Zhu, E. W. Plummer, and Jiandi Zhang
Heteroepitaxial growth of transition-metal oxide films on the open (111) surface of SrTiO_{3} results in significant restructuring due to the polar mismatch. Monitoring the structure and composition on an atomic scale of LaNiO_{3}/SrTiO_{3} (111) interface as a function of processing conditions has …
[Phys. Rev. B 95, 165434] Published Thu Apr 20, 2017



Origin of kinks in the energy dispersion of strongly correlated matter

2017-04-20T10:00:00-04:00

Author(s): Kazue Matsuyama, Edward Perepelitsky, and B. Sriram Shastry
We investigate the origin of ubiquitous low-energy kinks found in angle-resolved photoemission experiments in a variety of correlated matter. Such kinks are unexpected from weakly interacting electrons and hence identifying their origin should lead to fundamental insights in strongly correlated matt…
[Phys. Rev. B 95, 165435] Published Thu Apr 20, 2017



Tunable hyperbolic dispersion and negative refraction in natural electride materials

2017-04-20T10:00:00-04:00

Author(s): Shan Guan, Shao Ying Huang, Yugui Yao, and Shengyuan A. Yang
Hyperbolic (or indefinite) materials have attracted significant attention due to their unique capabilities for engineering electromagnetic space and controlling light propagation. A current challenge is to find a hyperbolic material with wide working frequency window, low energy loss, and easy contr…
[Phys. Rev. B 95, 165436] Published Thu Apr 20, 2017



Energy- and k-resolved mapping of the magnetic circular dichroism in threshold photoemission from Co films on Pt(111)

2017-04-20T10:00:00-04:00

Author(s): Maximilian Staab, Dmytro Kutnyakhov, Robert Wallauer, Sergey Chernov, Katerina Medjanik, Hans Joachim Elmers, Mathias Kläui, and Gerd Schönhense
The magnetic circular dichroism in threshold photoemission (TPMCD) for perpendicularly magnetized fcc Co films on Pt(111) has been revisited. A complete mapping of the spectral function I(E_{B},k_{x},k_{y}) (binding energy E_{B}, momentum parallel to surface k_{x}, k_{y}) and the corresponding TPMCD…
[Phys. Rev. B 95, 165437] Published Thu Apr 20, 2017



Solvable model for a dynamical quantum phase transition from fast to slow scrambling

2017-04-19T10:00:00-04:00

Author(s): Sumilan Banerjee and Ehud Altman
We propose an extension of the Sachdev-Ye-Kitaev (SYK) model that exhibits a quantum phase transition from the previously identified non-Fermi-liquid fixed point to a Fermi-liquid-like state, while still allowing an exact solution in a suitable large-N limit. The extended model involves coupling the…
[Phys. Rev. B 95, 134302] Published Wed Apr 19, 2017



Field-induced metastability of the modulation wave vector in a magnetic soliton lattice

2017-04-19T10:00:00-04:00

Author(s): M. Zhu, J. Peng, T. Hong, K. Prokes, T. Zou, Z. Q. Mao, and X. Ke
We present magnetic-field-induced metastability of the magnetic soliton lattice in a bilayer ruthenate Ca_{3}(Ru_{1−x}Fe_{x})_{2}O_{7}(x=0.05) through single-crystal neutron diffraction study. We show that the incommensurability of the modulation wave vector at zero field strongly depends on the his…
[Phys. Rev. B 95, 134429] Published Wed Apr 19, 2017



Absence of long-range order in the frustrated magnet SrDy_{2} O_{4} due to trapped defects from a dimensionality crossover

2017-04-19T10:00:00-04:00

Author(s): N. Gauthier, A. Fennell, B. Prévost, A.-C. Uldry, B. Delley, R. Sibille, A. Désilets-Benoit, H. A. Dabkowska, G. J. Nilsen, L.-P. Regnault, J. S. White, C. Niedermayer, V. Pomjakushin, A. D. Bianchi, and M. Kenzelmann
Magnetic frustration and low dimensionality can prevent long-range magnetic order and lead to exotic correlated ground states. SrDy_{2}O_{4} consists of magnetic Dy^{3+} ions forming magnetically frustrated zigzag chains along the c axis and shows no long-range order to temperatures as low as T=60 m…
[Phys. Rev. B 95, 134430] Published Wed Apr 19, 2017



Critical behavior of dissipative two-dimensional spin lattices

2017-04-19T10:00:00-04:00

Author(s): R. Rota, F. Storme, N. Bartolo, R. Fazio, and C. Ciuti
We explore critical properties of two-dimensional lattices of spins interacting via an anisotropic Heisenberg Hamiltonian that are subject to incoherent spin flips. We determine the steady-state solution of the master equation for the density matrix via the corner-space renormalization method. We in…
[Phys. Rev. B 95, 134431] Published Wed Apr 19, 2017



Simultaneous spin pumping and spin Seebeck experiments with thermal control of the magnetic damping in bilayers of yttrium iron garnet and heavy metals: YIG/Pt and YIG/IrMn

2017-04-19T10:00:00-04:00

Author(s): J. Holanda, O. Alves Santos, R. L. Rodríguez-Suárez, A. Azevedo, and S. M. Rezende
We report experiments on the generation of spin currents by simultaneous spin pumping effect and spin Seebeck effect (SSE) in bilayers of yttrium iron garnet (YIG)/Pt and YIG/IrMn. The experiments are performed with the ferromagnetic resonance (FMR) in YIG excited by microwave radiation in the range…
[Phys. Rev. B 95, 134432] Published Wed Apr 19, 2017



Voltage-controlled nanoscale reconfigurable magnonic crystal

2017-04-19T10:00:00-04:00

Author(s): Qi Wang, Andrii V. Chumak, Lichuan Jin, Huaiwu Zhang, Burkard Hillebrands, and Zhiyong Zhong
A nanoscale reconfigurable magnonic crystal is designed using voltage-controlled perpendicular magnetic anisotropy (PMA) in ferromagnetic-dielectric heterostructures. A periodic array of gate metallic strips is placed on top of a MgO/Co structure in order to apply a periodic electric field and to mo…
[Phys. Rev. B 95, 134433] Published Wed Apr 19, 2017



Crystal field effects in the intermetallic RNi_{3} Ga_{9} (R=Tb, Dy, Ho, and Er) compounds

2017-04-19T10:00:00-04:00

Author(s): L. S. Silva, S. G. Mercena, D. J. Garcia, E. M. Bittar, C. B. R. Jesus, P. G. Pagliuso, R. Lora-Serrano, C. T. Meneses, and J. G. S. Duque
In this paper, we report temperature-dependent magnetic susceptibility, electrical resistivity, and heat-capacity experiments in the family of intermetallic compounds RNi_{3}Ga_{9} (R = Tb, Dy, Ho, and Er). Single-crystalline samples were grown using Ga self-flux method. These materials crystallize …
[Phys. Rev. B 95, 134434] Published Wed Apr 19, 2017



Isotropic Cooper pairs with emergent sign changes in a single-layer iron superconductor

2017-04-19T10:00:00-04:00

Author(s): J. P. Rodriguez
We model a single layer of heavily electron-doped FeSe by spin-1/2 moments over a square lattice of iron atoms that include the 3d_{xz} and 3d_{yz} orbitals, at strong on-site Coulomb repulsion. Above half filling, we find emergent hole bands below the Fermi level at the center of the one-iron Brill…
[Phys. Rev. B 95, 134511] Published Wed Apr 19, 2017



Superfluid field response to edge dislocation motion

2017-04-19T10:00:00-04:00

Author(s): Abdul N. Malmi-Kakkada, Oriol T. Valls, and Chandan Dasgupta
We study the dynamic response of a superfluid field to a moving edge dislocation line to which the field is minimally coupled. We use a dissipative Gross-Pitaevskii equation, and determine the initial conditions by solving the equilibrium version of the model. We consider the subsequent time evoluti…
[Phys. Rev. B 95, 134512] Published Wed Apr 19, 2017



Monolayer alkali and transition-metal monoxides: MgO, CaO, MnO, and NiO

2017-04-19T10:00:00-04:00

Author(s): F. Shayeganfar, K. S. Vasu, R. R. Nair, F. M. Peeters, and M. Neek-Amal
Two-dimensional crystals with strong interactions between layers has attracted increasing attention in recent years in a variety of fields. In particular, the growth of a single layer of oxide materials (e.g., MgO, CaO, NiO, and MnO) over metallic substrates were found to display different physical …
[Phys. Rev. B 95, 144109] Published Wed Apr 19, 2017



Representation of compounds for machine-learning prediction of physical properties

2017-04-19T10:00:00-04:00

Author(s): Atsuto Seko, Hiroyuki Hayashi, Keita Nakayama, Akira Takahashi, and Isao Tanaka
The representations of a compound, called “descriptors” or “features”, play an essential role in constructing a machine-learning model of its physical properties. In this study, we adopt a procedure for generating a set of descriptors from simple elemental and structural representations. First, it i…
[Phys. Rev. B 95, 144110] Published Wed Apr 19, 2017



Shear-strain gradient induced polarization reversal in ferroelectric BaTiO_{3} thin films: A first-principles total-energy study

2017-04-19T10:00:00-04:00

Author(s): Guannan Li, Xiaokun Huang, Jingsan Hu, and Weiyi Zhang
Based on the first-principles total-energy calculation, we have studied the shear-strain gradient effect on the polarization reversal of ferroelectric BaTiO_{3} thin films. By calculating the energies of double-domain supercells for different electric polarization, shear-strain gradients, and domain…
[Phys. Rev. B 95, 144111] Published Wed Apr 19, 2017



Propagation and jamming dynamics in Heisenberg spin ladders

2017-04-19T10:00:00-04:00

Author(s): Carlo B. Krimphoff, Masudul Haque, and Andreas M. Läuchli
We investigate the propagation dynamics of initially localized excitations in spin-1/2 Heisenberg ladders. We consider initial states with two overturned spins, either on neighboring sites on the same leg or on the two sites of a single rung, in an otherwise polarized (ferromagnetic) background. Com…
[Phys. Rev. B 95, 144308] Published Wed Apr 19, 2017



Thermal conductivity decomposition in two-dimensional materials: Application to graphene

2017-04-19T10:00:00-04:00

Author(s): Zheyong Fan, Luiz Felipe C. Pereira, Petri Hirvonen, Mikko M. Ervasti, Ken R. Elder, Davide Donadio, Tapio Ala-Nissila, and Ari Harju
Two-dimensional materials have unusual phonon spectra due to the presence of flexural (out-of-plane) modes. Although molecular dynamics simulations have been extensively used to study heat transport in such materials, conventional formalisms treat the phonon dynamics isotropically. Here, we decompos…
[Phys. Rev. B 95, 144309] Published Wed Apr 19, 2017



Glassy quantum dynamics in translation invariant fracton models

2017-04-19T10:00:00-04:00

Author(s): Abhinav Prem, Jeongwan Haah, and Rahul Nandkishore
We investigate relaxation in the recently discovered “fracton” models and discover that these models naturally host glassy quantum dynamics in the absence of quenched disorder. We begin with a discussion of “type I” fracton models, in the taxonomy of Vijay, Haah, and Fu. We demonstrate that in these…
[Phys. Rev. B 95, 155133] Published Wed Apr 19, 2017



Theoretical models of Rashba spin splitting in asymmetric SrTiO_{3} -based heterostructures

2017-04-19T10:00:00-04:00

Author(s): L. W. van Heeringen, A. McCollam, G. A. de Wijs, and A. Fasolino
Rashba spin splitting in two-dimensional (2D) semiconductor systems is generally calculated in a k·p Luttinger-Kohn approach where the spin splitting due to asymmetry emerges naturally from the bulk band structure. In recent years, several new classes of 2D systems have been discovered where electro…
[Phys. Rev. B 95, 155134] Published Wed Apr 19, 2017



Excitonic effects in the optical properties of hydrogenated anatase TiO_{2}

2017-04-19T10:00:00-04:00

Author(s): S. S. Ataei, M. R. Mohammadizadeh, and N. Seriani
Optical absorption spectra and excitonic properties of hydrogenated anatase titania have been calculated by ab initio calculations based on density functional theory, GW approximation, and the Bethe-Salpeter equation. Neutral hydrogen impurities lead to enhanced absorption in the infrared and visibl…
[Phys. Rev. B 95, 155205] Published Wed Apr 19, 2017



Spin dynamics of quadrupole nuclei in InGaAs quantum dots

2017-04-19T10:00:00-04:00

Author(s): M. S. Kuznetsova, R. V. Cherbunin, I. Ya. Gerlovin, I. V. Ignatiev, S. Yu. Verbin, D. R. Yakovlev, D. Reuter, A. D. Wieck, and M. Bayer
Photoluminescence polarization is experimentally studied for samples with (In,Ga)As/GaAs self-assembled quantum dots in transverse magnetic field (Hanle effect) under slow modulation of the excitation light polarization from fractions of Hz to tens of kHz. The polarization reflects the evolution of …
[Phys. Rev. B 95, 155312] Published Wed Apr 19, 2017



Local electronic properties of the graphene-protected giant Rashba-split BiAg_{2} surface

2017-04-19T10:00:00-04:00

Author(s): Julia Tesch, Elena Voloshina, Milan Jubitz, Yuriy Dedkov, and Mikhail Fonin
We report the preparation of an interface between graphene and a strong Rashba-split BiAg_{2} surface alloy and an investigation of its structure as well as the electronic properties by means of scanning tunneling microscopy/spectroscopy and density functional theory calculations. Upon evaluation of…
[Phys. Rev. B 95, 155428] Published Wed Apr 19, 2017



Luttinger liquids, Fermi liquids, and fractional statistics

2017-04-19T10:00:00-04:00

Author(s): Jon Magne Leinaas
We discuss how one-dimensional interacting fermion systems, which in the low-energy approximation are described by Luttinger liquid theory, can be reformulated as systems of weakly interacting particles with fractional charge and statistics. Our approach is to use Landau's phenomenological approach …
[Phys. Rev. B 95, 155429] Published Wed Apr 19, 2017



Topological staggered field electric effect with bipartite magnets

2017-04-19T10:00:00-04:00

Author(s): Stefan Rex, Flavio S. Nogueira, and Asle Sudbø
We study the interface physics of bipartite magnetic materials deposited on a topological insulator. Our study comprises antiferromagnets as well as ferrimagnets and ferromagnets with multiple magnetic moments per unit cell. If an energy gap is induced in the Dirac states on the topological surface,…
[Phys. Rev. B 95, 155430] Published Wed Apr 19, 2017



Gauge freedom in observables and Landsberg's nonadiabatic geometric phase: Pumping spectroscopy of interacting open quantum systems

2017-04-19T10:00:00-04:00

Author(s): T. Pluecker, M. R. Wegewijs, and J. Splettstoesser
We set up a general density-operator approach to geometric steady-state pumping through slowly driven open quantum systems. This approach applies to strongly interacting systems that are weakly coupled to multiple reservoirs at high temperature, illustrated by an Anderson quantum dot. Pumping gives …
[Phys. Rev. B 95, 155431] Published Wed Apr 19, 2017



Single-atom gating and magnetic interactions in quantum corrals

2017-04-19T10:00:00-04:00

Author(s): Anh T. Ngo, Eugene H. Kim, and Sergio E. Ulloa
Single-atom gating, achieved by manipulation of adatoms on a surface, has been shown in experiments to allow precise control over superposition of electronic states in quantum corrals. Using a Green's function approach, we demonstrate theoretically that such atom gating can also be used to control t…
[Phys. Rev. B 95, 161407(R)] Published Wed Apr 19, 2017



Accurate electronic free energies of the 3d,4d, and 5d transition metals at high temperatures

2017-04-19T10:00:00-04:00

Author(s): Xi Zhang, Blazej Grabowski, Fritz Körmann, Christoph Freysoldt, and Jörg Neugebauer
Free energies of bulk materials are nowadays routinely computed by density functional theory. In particular for metals, electronic excitations can significantly contribute to the free energy. For an ideal static lattice, this contribution can be obtained at low computational cost, e.g., from the ele…
[Phys. Rev. B 95, 165126] Published Wed Apr 19, 2017



Collective modes in the paramagnetic phase of the Hubbard model

2017-04-19T10:00:00-04:00

Author(s): Vu Hung Dao and Raymond Frésard
The charge dynamical response function of the Hubbard model is investigated on the square lattice in the thermodynamic limit. The obtained charge-excitation spectra consist of a continuum, a gapless collective mode with anisotropic zero-sound velocity, and a correlation-induced high-frequency mode a…
[Phys. Rev. B 95, 165127] Published Wed Apr 19, 2017



Fragment approach to the electronic structure of τ-boron allotrope

2017-04-19T10:00:00-04:00

Author(s): Naiwrit Karmodak and Eluvathingal D. Jemmis
The presence of nonconventional bonding features is an intriguing part of elemental boron. The recent addition of τ boron to the family of three-dimensional boron allotropes is no exception. We provide an understanding of the electronic structure of τ boron using a fragment molecular approach, where…
[Phys. Rev. B 95, 165128] Published Wed Apr 19, 2017



Compressed tetragonal phase in XFe_{2} As_{2} (X=Na, K, Rb, Cs) and in the alloy Na_{0.5} K_{0.5} Fe_{2} As_{2}

2017-04-19T10:00:00-04:00

Author(s): Cesare Tresca and Gianni Profeta
Motivated by the recent discovery of a high-temperature superconducting phase in KFe_{2}As_{2} at 16 GPa accompanied by an isostructural phase transition from the tetragonal to the compressed tetragonal phase, we extend the study of pressure effects to the whole XFe_{2}As_{2} family (X=Na, K, Rb, Cs…
[Phys. Rev. B 95, 165129] Published Wed Apr 19, 2017



Suppression of supercollision carrier cooling in high mobility graphene on SiC(0001 [over ¯] )

2017-04-19T10:00:00-04:00

Author(s): Takashi Someya, Hirokazu Fukidome, Hiroshi Watanabe, Takashi Yamamoto, Masaru Okada, Hakuto Suzuki, Yu Ogawa, Takushi Iimori, Nobuhisa Ishii, Teruto Kanai, Keiichiro Tashima, Baojie Feng, Susumu Yamamoto, Jiro Itatani, Fumio Komori, Kozo Okazaki, Shik Shin, and Iwao Matsuda

Graphene, a two-dimensional monatomic layer of crystal carbon, has recently emerged as a potential material for next-generation optoelectronic devices owing to unique properties arising from its massless Dirac fermions. However, the intrinsic carrier dynamics of graphene has remained a mystery even for the simple case of carrier cooling after the photoexcitation. This is because the observed temporal variations of the nonequilibrium carriers in graphene have been thoroughly described in terms of a defect-induced extrinsic effect known as “supercollision” (SC). The SC process is based on defect-mediated electron-acoustic phonon scattering and theoretically has been predicted to reduce with the increase of mobility of a material. Here, the authors have prepared extremely high mobility graphene and traced the dynamics of photoexcited carriers in the Dirac bands directly by time- and angle-resolved photoemission spectroscopy. They successfully observed suppression of SC and extracted the intrinsic dynamical properties of graphene, such as anharmonic decay of the optical phonons and the bottleneck relaxation at the Dirac point. Breaking the limit of SC, their research also has technological significance in developing graphene-based optoelectronic devices.

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[Phys. Rev. B 95, 165303] Published Wed Apr 19, 2017



Dressed photon-orbital states in a quantum dot: Intervalley spin resonance

2017-04-19T10:00:00-04:00

Author(s): P. Scarlino, E. Kawakami, T. Jullien, D. R. Ward, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, M. A. Eriksson, and L. M. K. Vandersypen
The valley degree of freedom is intrinsic to spin qubits in Si/SiGe quantum dots. It has been viewed alternately as a hazard, especially when the lowest valley-orbit splitting is small compared to the thermal energy, or as an asset, most prominently in proposals to use the valley degree of freedom i…
[Phys. Rev. B 95, 165429] Published Wed Apr 19, 2017



Surface electron states on the quasi-two-dimensional excess-electron compounds Ca_{2} N and Y_{2} C

2017-04-19T10:00:00-04:00

Author(s): Takeshi Inoshita, Seiji Takemoto, Tomofumi Tada, and Hideo Hosono
Compounds having excess electrons from the formal valence viewpoint (electrides) are a new class of materials, which often take low-dimensional structures. We studied the (001) surface electronic structures of quasi-two-dimensional electrides Ca_{2}N and Y_{2}C by density functional theory using a s…
[Phys. Rev. B 95, 165430] Published Wed Apr 19, 2017



Inelastic electron tunneling spectroscopy in molecular junctions showing quantum interference

2017-04-19T10:00:00-04:00

Author(s): C. Salhani, M. L. Della Rocca, C. Bessis, R. Bonnet, C. Barraud, P. Lafarge, A. Chevillot, P. Martin, and J.-C. Lacroix
Destructive quantum interference effect is implemented in large area molecular junctions to improve signatures of electron-phonon interaction. Vertical molecular junctions based on a cross-conjugated anthraquinone layer were fabricated and low-noise transport measurements were performed by acquiring…
[Phys. Rev. B 95, 165431] Published Wed Apr 19, 2017



Mixing of spin and orbital angular momenta via second-harmonic generation in plasmonic and dielectric chiral nanostructures

2017-04-19T10:00:00-04:00

Author(s): Xiaoyan Y. Z. Xiong, Ahmed Al-Jarro, Li Jun Jiang, Nicolae C. Panoiu, and Wei E. I. Sha
We present a theoretical study of the characteristics of the nonlinear spin-orbital angular momentum coupling induced by second-harmonic generation in plasmonic and dielectric nanostructures made of centrosymmetric materials. In particular, the connection between the phase singularities and polariza…
[Phys. Rev. B 95, 165432] Published Wed Apr 19, 2017



How square ice helps lubrication

2017-04-19T10:00:00-04:00

Author(s): Astrid S. de Wijn and Lars G. M. Pettersson
In the context of friction we use atomistic molecular-dynamics simulations to investigate water confined between graphene sheets over a wide range of pressures. We find that thermal equilibration of the confined water is hindered at high pressures. We demonstrate that, under the right conditions, sq…
[Phys. Rev. B 95, 165433] Published Wed Apr 19, 2017



Zinc-blende to rocksalt transition in SiC in a laser-heated diamond-anvil cell

2017-04-18T10:00:00-04:00

Author(s): Kierstin Daviau and Kanani K. M. Lee
We explore the stability of the ambient pressure zinc-blende polymorph (B3) structure of silicon carbide (SiC) at high pressures and temperatures where it transforms to the rocksalt (B1) structure. We find that the transition occurs ∼40 GPa lower than previously measured when heated to moderately hi…
[Phys. Rev. B 95, 134108] Published Tue Apr 18, 2017



Theoretical search for possible Au-Si crystal structures using a genetic algorithm

2017-04-18T10:00:00-04:00

Author(s): Yue-Hang Dong, Wen-Cai Lu, Xin Xu, Xin Zhao, K. M. Ho, and C. Z. Wang
We performed a global search for possible Au-Si crystal structures using a genetic algorithm (GA) combined with density functional theory (DFT) calculations. Two Au-Si structures, Au_{8}Si_{8} and Au_{16}Si_{8}, were found to be energetically stable and have no imaginary frequencies by phonon calcul…
[Phys. Rev. B 95, 134109] Published Tue Apr 18, 2017



Field-induced phase diagram of the XY pyrochlore antiferromagnet Er_{2} Ti_{2} O_{7}

2017-04-18T10:00:00-04:00

Author(s): E. Lhotel, J. Robert, E. Ressouche, F. Damay, I. Mirebeau, J. Ollivier, H. Mutka, P. Dalmas de Réotier, A. Yaouanc, C. Marin, C. Decorse, and S. Petit
We explore the field-temperature phase diagram of the XY pyrochlore antiferromagnet Er_{2}Ti_{2}O_{7} by means of magnetization and neutron diffraction experiments. Depending on the field strength and direction relative to the high symmetry cubic directions [001],[11[over ¯]0], and [111], the refine…
[Phys. Rev. B 95, 134426] Published Tue Apr 18, 2017



Magnetism of monomer MnO and heterodimer FePt@MnO nanoparticles

2017-04-18T10:00:00-04:00

Author(s): X. Sun (孙笑), A. Klapper, Y. Su (苏夷希), K. Nemkovski, A. Wildes, H. Bauer, O. Köhler, A. Schilmann, W. Tremel, O. Petracic, and Th. Brückel
We report about the magnetic properties of antiferromagnetic (AF) MnO nanoparticles (NPs) with different sizes (6–19 nm). Using a combination of polarized neutron scattering and magnetometry, we were able to resolve previously observed peculiarities. Magnetometry, on the one hand, reveals a peak in …
[Phys. Rev. B 95, 134427] Published Tue Apr 18, 2017



Competing exchange bias and field-induced ferromagnetism in La-doped BaFeO_{3}

2017-04-18T10:00:00-04:00

Author(s): I. Fita, A. Wisniewski, R. Puzniak, P. Iwanowski, V. Markovich, S. Kolesnik, and B. Dabrowski
An exchange bias (EB) effect was observed in mixed valent La_{x}Ba_{1−x}FeO_{3} (x=0.125, 0.25, 0.33) perovskites exhibiting the antiferromagnetic (AFM) helical order among Fe^{4+} ions coexisting with the ferromagnetic (FM) cluster phase in the ground state. The La^{3+} ions for Ba^{2+} site substi…
[Phys. Rev. B 95, 134428] Published Tue Apr 18, 2017



Barkhausen noise probe of the ferroelectric transition in the relaxor PbMg_{1/3} Nb_{2/3} O_{3} −12%PbTiO_{3}

2017-04-18T10:00:00-04:00

Author(s): Xinyang Zhang, Corbyn Mellinger, Eugene V. Colla, M. B. Weissman, and D. D. Viehland
Barkhausen current noise is used to probe the slow field-driven conversion of the glassy relaxor ferroelectric state to an ordered ferroelectric state. The frequent presence of distinct micron-scale Barkhausen events well before the polarization current starts to speed up shows that the process is n…
[Phys. Rev. B 95, 144203] Published Tue Apr 18, 2017



Localization landscape theory of disorder in semiconductors. I. Theory and modeling

2017-04-18T10:00:00-04:00

Author(s): Marcel Filoche, Marco Piccardo, Yuh-Renn Wu, Chi-Kang Li, Claude Weisbuch, and Svitlana Mayboroda
We present here a model of carrier distribution and transport in semiconductor alloys accounting for quantum localization effects in disordered materials. This model is based on the recent development of a mathematical theory of quantum localization which introduces for each type of carrier a spatia…
[Phys. Rev. B 95, 144204] Published Tue Apr 18, 2017



Localization landscape theory of disorder in semiconductors. II. Urbach tails of disordered quantum well layers

2017-04-18T10:00:00-04:00

Author(s): Marco Piccardo, Chi-Kang Li, Yuh-Renn Wu, James S. Speck, Bastien Bonef, Robert M. Farrell, Marcel Filoche, Lucio Martinelli, Jacques Peretti, and Claude Weisbuch
Urbach tails in semiconductors are often associated to effects of compositional disorder. The Urbach tail observed in InGaN alloy quantum wells of solar cells and LEDs by biased photocurrent spectroscopy is shown to be characteristic of the ternary alloy disorder. The broadening of the absorption ed…
[Phys. Rev. B 95, 144205] Published Tue Apr 18, 2017



Localization landscape theory of disorder in semiconductors. III. Application to carrier transport and recombination in light emitting diodes

2017-04-18T10:00:00-04:00

Author(s): Chi-Kang Li, Marco Piccardo, Li-Shuo Lu, Svitlana Mayboroda, Lucio Martinelli, Jacques Peretti, James S. Speck, Claude Weisbuch, Marcel Filoche, and Yuh-Renn Wu
This paper introduces a novel method to account for quantum disorder effects into the classical drift-diffusion model of semiconductor transport through the localization landscape theory. Quantum confinement and quantum tunneling in the disordered system change dramatically the energy barriers actin…
[Phys. Rev. B 95, 144206] Published Tue Apr 18, 2017



Quantum spin liquid with seven elementary particles

2017-04-18T10:00:00-04:00

Author(s): Haoyu Wang, Hitesh J. Changlani, Yuan Wan, and Oleg Tchernyshyov
We present an exactly solvable model of a quantum spin liquid with Abelian anyons in d=2 spatial dimensions. With spins 1/2 on a triangular lattice and six-body interactions, our model has zero spin correlation length and localized elementary excitations like the toric codes of Kitaev and Wen. In co…
[Phys. Rev. B 95, 144425] Published Tue Apr 18, 2017



Unconventional superconductivity and anomalous response in hole-doped transition metal dichalcogenides

2017-04-18T10:00:00-04:00

Author(s): Evan Sosenko, Junhua Zhang, and Vivek Aji
Two-dimensional transition metal dichalcogenides entwine interaction, spin-orbit coupling, and topology. Hole-doped systems lack spin degeneracy: states are indexed with spin and valley specificity. This unique structure offers new possibilities for correlated phases and phenomena. We realize an unc…
[Phys. Rev. B 95, 144508] Published Tue Apr 18, 2017



Stability and instability towards delocalization in many-body localization systems

2017-04-18T10:00:00-04:00

Author(s): Wojciech De Roeck and François Huveneers

Many-body localization plays an increasing role in condensed matter theory, both because it challenges the fundaments of statistical physics, and because it allows us to engineer several new, exotic, stable phases of matter. In this paper, the authors address the issue of the stability of a many-body localized material in contact with an ergodic grain, i.e., an imperfect bath made of a few interacting degrees of freedom. Thanks to detailed microscopic analysis and numerics, they conclude that such an ergodic grain eventually destabilizes the localized phase in the following cases: if the spatial dimension is higher than one, or if the spatial dimension is one but the localization length of the localized material is larger than a fixed threshold value. In realistic materials, these ergodic grains are always present as Griffiths regions where the disorder is anomalously small, and hence, the authors conclude that the localized phase in such materials is unstable, strictly speaking. Transport and thermalization are however exponentially suppressed in the distance between ergodic grains.

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[Phys. Rev. B 95, 155129] Published Tue Apr 18, 2017



Local correlation functions of arbitrary order for the Falicov-Kimball model

2017-04-18T10:00:00-04:00

Author(s): T. Ribic, G. Rohringer, and K. Held
Local n-particle vertex functions represent the crucial ingredient for diagrammatic extensions of dynamical mean field theory (DMFT). Hitherto their application has been restricted—with a few exceptions—to the n=2-particle vertex while higher-order vertices have been neglected. In this paper we deri…
[Phys. Rev. B 95, 155130] Published Tue Apr 18, 2017



Thermoelectric transport in disordered metals without quasiparticles: The Sachdev-Ye-Kitaev models and holography

2017-04-18T10:00:00-04:00

Author(s): Richard A. Davison, Wenbo Fu, Antoine Georges, Yingfei Gu, Kristan Jensen, and Subir Sachdev

Essentially all high temperature superconductors display a “strange metal” regime above their critical temperatures, where electrical and thermal transport cannot be explained within the traditional Fermi liquid paradigm of quasiparticle excitations. This paper focuses on the first, and newly discovered, solvable theory of a disordered metal without quasiparticle excitations, obtained by extending the Sachdev-Ye-Kitaev (SYK) models to finite spatial dimensions. The complete thermoelectric conductivity matrix is computed, and a surprising exact relation is found between the Seebeck coefficient and the derivative of the thermodynamic entropy with respect to the density. These computations are then compared with holographic theories which map strange metals onto black holes in theories of quantum gravity with one extra spatial dimension.

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[Phys. Rev. B 95, 155131] Published Tue Apr 18, 2017



Deviation from bulk in the pressure-temperature phase diagram of V_{2} O_{3} thin films

2017-04-18T10:00:00-04:00

Author(s): I. Valmianski, Juan Gabriel Ramirez, C. Urban, X. Batlle, and Ivan K. Schuller
We found atypical pressure dependence in the transport measurements of the metal to insulator transition (MIT) in epitaxial thin films of vanadium sesquioxide (V_{2}O_{3}). Three different crystallographic orientations and four thicknesses, ranging from 40 to 500 nm, were examined under hydrostatic …
[Phys. Rev. B 95, 155132] Published Tue Apr 18, 2017



Optical properties of periodic systems within the current-current response framework: Pitfalls and remedies

2017-04-18T10:00:00-04:00

Author(s): Davide Sangalli, J. A. Berger, Claudio Attaccalite, Myrta Grüning, and Pina Romaniello
We compare the optical absorption of extended systems using the density-density and current-current linear response functions calculated within many-body perturbation theory. The two approaches are formally equivalent for a finite momentum q of the external perturbation. At q=0, however, the equival…
[Phys. Rev. B 95, 155203] Published Tue Apr 18, 2017



Role of phonons in the quantum chaos of Rydberg excitons

2017-04-18T10:00:00-04:00

Author(s): Marcel Freitag, Julian Heckötter, Manfred Bayer, and Marc Aßmann
We investigate the transition from regular behavior towards chaos for Rydberg excitons in the presence of an external magnetic field. To this end, we develop a measure for chaos that is robust with respect to fluctuations in the density of states. We find that irrespective of whether or not the magn…
[Phys. Rev. B 95, 155204] Published Tue Apr 18, 2017



Two-dimensional semiconducting gold

2017-04-18T10:00:00-04:00

Author(s): Ning Liu, Shifeng Jin, Liwei Guo, Gang Wang, Hezhu Shao, Liang Chen, and Xiaolong Chen
We show that two-dimensional (2D) honeycomb gold (HG) could be thermodynamic and lattice dynamic stable owing in part to the relativistic effect and electronic configuration. HG exhibits a covalent characteristic in its bonding and is a semiconductor with an energy gap of 0.1 eV at the Brillouin zon…
[Phys. Rev. B 95, 155311] Published Tue Apr 18, 2017



Genetic algorithm prediction of two-dimensional group-IV dioxides for dielectrics

2017-04-18T10:00:00-04:00

Author(s): Arunima K. Singh, Benjamin C. Revard, Rohit Ramanathan, Michael Ashton, Francesca Tavazza, and Richard G. Hennig

Researchers predict new two-dimensional materials whose structures differ from their three-dimensional counterparts.

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[Phys. Rev. B 95, 155426] Published Tue Apr 18, 2017



Transport properties of a hybrid Majorana wire-quantum dot system with ferromagnetic contacts

2017-04-18T10:00:00-04:00

Author(s): I. Weymann and K. P. Wójcik
The transport properties of a quantum dot coupled to ferromagnetic contacts and attached to a topological superconductor wire hosting Majorana zero-energy modes at its ends are studied theoretically in the Kondo regime. By using the numerical renormalization group method, the temperature and dot lev…
[Phys. Rev. B 95, 155427] Published Tue Apr 18, 2017



Covalent versus localized nature of 4f electrons in ceria: Resonant angle-resolved photoemission spectroscopy and density functional theory

2017-04-18T10:00:00-04:00

Author(s): Tomáš Duchoň, Marie Aulická, Eike F. Schwier, Hideaki Iwasawa, Chuanlin Zhao, Ye Xu, Kateřina Veltruská, Kenya Shimada, and Vladimír Matolín
We have conducted resonant angle-resolved photoemission spectroscopy of well-defined CeO_{2}(111) and c–Ce_{2}O_{3}(111) model surfaces, revealing distinct f contributions in the valence band of the two compounds. In conjunction with density functional theory calculations, we show that the f contrib…
[Phys. Rev. B 95, 165124] Published Tue Apr 18, 2017



Origin of layer dependence in band structures of two-dimensional materials

2017-04-18T10:00:00-04:00

Author(s): Mit H. Naik and Manish Jain
We study the origin of layer dependence in band structures of two-dimensional (2D) materials. We find that the layer dependence, at the density functional theory (DFT) level, is a result of quantum confinement and the nonlinearity of the exchange-correlation functional. We use this to develop an eff…
[Phys. Rev. B 95, 165125] Published Tue Apr 18, 2017



Multimode directionality in all-dielectric metasurfaces

2017-04-18T10:00:00-04:00

Author(s): Yuanqing Yang, Andrey E. Miroshnichenko, Sarah V. Kostinski, Mikhail Odit, Polina Kapitanova, Min Qiu, and Yuri S. Kivshar
We demonstrate that spectrally diverse multiple magnetic dipole resonances can be excited in all-dielectric structures lacking rotational symmetry, in contrast to conventionally used spheres, disks, or spheroids. Such multiple magnetic resonances arise from hybrid Mie-Fabry-Perot modes, and can cons…
[Phys. Rev. B 95, 165426] Published Tue Apr 18, 2017



Symmetry characterization of the collective modes of the phase diagram of the ν=0 quantum Hall state in graphene: Mean-field phase diagram and spontaneously broken symmetries

2017-04-18T10:00:00-04:00

Author(s): J. R. M. de Nova and I. Zapata
We devote this work to the study of the mean-field phase diagram of the ν=0 quantum Hall state in bilayer graphene and the computation of the corresponding neutral collective modes, extending the results of recent works in the literature. Specifically, we provide a detailed classification of the com…
[Phys. Rev. B 95, 165427] Published Tue Apr 18, 2017



Effects of environmental conditions on the ultrafast carrier dynamics in graphene revealed by terahertz spectroscopy

2017-04-18T10:00:00-04:00

Author(s): H. A. Hafez, X. Chai, Y. Sekine, M. Takamura, K. Oguri, I. Al-Naib, M. M. Dignam, H. Hibino, and T. Ozaki
A thorough understanding of the stability of graphene under ambient environmental conditions is essential for future graphene-based applications. In this paper, we study the effects of ambient temperature on the properties of monolayer graphene using terahertz time-domain spectroscopy as well as tim…
[Phys. Rev. B 95, 165428] Published Tue Apr 18, 2017



Influence of image forces on electron transport in ferroelectric tunnel junctions

2017-04-17T10:00:00-04:00

Author(s): O. G. Udalov and I. S. Beloborodov
We study influence of image forces on conductance of ferroelectric tunnel junctions. We show that the influence of image forces is twofold: (i) they enhance the electroresistance effect due to polarization hysteresis in symmetric tunnel junctions at nonzero bias, and (ii) they produce the electrores…
[Phys. Rev. B 95, 134106] Published Mon Apr 17, 2017



Analytic approximations for the elastic moduli of two-phase materials

2017-04-17T10:00:00-04:00

Author(s): Z. J. Zhang, Y. K. Zhu, P. Zhang, Y. Y. Zhang, W. Pantleon, and Z. F. Zhang
Based on the models of series and parallel connections of the two phases in a composite, analytic approximations are derived for the elastic constants (Young's modulus, shear modulus, and Poisson's ratio) of elastically isotropic two-phase composites containing second phases of various volume fracti…
[Phys. Rev. B 95, 134107] Published Mon Apr 17, 2017



Robust spin transfer torque in antiferromagnetic tunnel junctions

2017-04-17T10:00:00-04:00

Author(s): Hamed Ben Mohamed Saidaoui, Xavier Waintal, and Aurélien Manchon
We theoretically study the current-induced spin torque in antiferromagnetic tunnel junctions, composed of two semi-infinite antiferromagnetic layers separated by a tunnel barrier, in both clean and disordered regimes. We find that the torque enabling electrical manipulation of the Néel antiferromagn…
[Phys. Rev. B 95, 134424] Published Mon Apr 17, 2017



Raman scattering in a two-dimensional Fermi liquid with spin-orbit coupling

2017-04-17T10:00:00-04:00

Author(s): Saurabh Maiti and Dmitrii L. Maslov
We present a microscopic theory of Raman scattering in a two-dimensional Fermi liquid (FL) with Rashba and Dresselhaus types of spin-orbit coupling and subject to an in-plane magnetic field (B[over ⃗]). In the long-wavelength limit, the Raman spectrum probes the collective modes of such a FL: the ch…
[Phys. Rev. B 95, 134425] Published Mon Apr 17, 2017



Magnetization precession induced by picosecond acoustic pulses in a freestanding film acting as an acoustic cavity

2017-04-17T10:00:00-04:00

Author(s): Ji-Wan Kim and Jean-Yves Bigot
We report the magnetization dynamics excited by picosecond acoustic pulses confined in the acoustic cavity of freestanding nickel films. By detecting both sides of the sample we show that acoustic pulses moving back and forth inside the cavity efficiently control the magnetization precession. The mu…
[Phys. Rev. B 95, 144422] Published Mon Apr 17, 2017



Low-energy magnetoelectric control of domain states in exchange-coupled heterostructures

2017-04-17T10:00:00-04:00

Author(s): Muftah Al-Mahdawi, Satya Prakash Pati, Yohei Shiokawa, Shujun Ye, Tomohiro Nozaki, and Masashi Sahashi
The electric manipulation of antiferromagnets has become an area of great interest recently for zero-stray-field spintronic devices, and for their rich spin dynamics. Generally, the application of antiferromagnetic media for information memories and storage requires a heterostructure with a ferromag…
[Phys. Rev. B 95, 144423] Published Mon Apr 17, 2017



Contribution from optically excited many-electron states to the superexchange interaction in Mott-Hubbard insulators

2017-04-17T10:00:00-04:00

Author(s): Vladimir A. Gavrichkov, Semen I. Polukeev, and Sergey G. Ovchinnikov
We investigated the effects of excited many-electron states in the optical control of the magnetic state in undoped Mott-Hubbard insulator. To derive the spin Hamiltonian in material under optical pumping one has used a many-electron approach based on the X-operator representation. Extending the pro…
[Phys. Rev. B 95, 144424] Published Mon Apr 17, 2017



Possible superconductivity in the electron-doped chromium pnictide LaOCrAs

2017-04-17T10:00:00-04:00

Author(s): Wan-Sheng Wang, Miao Gao, Yang Yang, Yuan-Yuan Xiang, and Qiang-Hua Wang
We constructed an effective tight-binding model with five Cr 3d orbitals for LaOCrAs according to first-principles calculations. Based on this model, we investigated possible superconductivity induced by interactions in doped LaOCrAs using the functional renormalization group (FRG). We find that the…
[Phys. Rev. B 95, 144507] Published Mon Apr 17, 2017



Superconductivity in type-II Weyl semimetals

2017-04-17T10:00:00-04:00

Author(s): M. Alidoust, K. Halterman, and A. A. Zyuzin
We study superconductivity in a Weyl semimetal with a tilted dispersion around two Weyl points of opposite chirality. In the absence of any tilt, the state with zero momentum pairing between two Fermi sheets enclosing each Weyl point has four point nodes in the superconducting gap function. Moreover…
[Phys. Rev. B 95, 155124] Published Mon Apr 17, 2017



Towards first-principles prediction of valence instabilities in mixed stack charge-transfer crystals

2017-04-17T10:00:00-04:00

Author(s): Francesca Delchiaro, Alberto Girlando, Anna Painelli, Arkamita Bandyopadhyay, Swapan K. Pati, and Gabriele D'Avino
Strongly correlated electrons delocalized on one-dimensional (1D) soft stacks govern the complex physics of mixed stack charge-transfer crystals, a well-known family of materials composed of electron-donor (D) and acceptor (A) molecules alternating along the 1D chain. The complex physics of these sy…
[Phys. Rev. B 95, 155125] Published Mon Apr 17, 2017



Dynamically enriched topological orders in driven two-dimensional systems

2017-04-17T10:00:00-04:00

Author(s): Andrew C. Potter and Takahiro Morimoto

Time-periodic driving enables new nonequilibrium quantum phases of matter with topologically protected and quantum coherent motion that would be forbidden in thermal equilibrium. This work uncovers two new classes of driven topological phases in driven two-dimensional spin systems: i) Floquet symmetry protected topological phases, which are driven and interacting analogs of topological insulators whose edge states are protected against disorder and localization; and ii) Floquet enriched topological orders, in which time-dependent driving “breaks” the spins into anyonic particles with fractional statistics and oscillating topological charge. The physics of these phases is explored by constructing toy models that can be explicitly solved despite the presence of strong interactions.

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[Phys. Rev. B 95, 155126] Published Mon Apr 17, 2017