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Preview: Recent Articles in Phys. Rev. B

Recent Articles in Phys. Rev. B



Recent articles in Physical Review B



Published: 2017-07-28T14:06:15-04:00

 



Model of orbital populations for voltage-controlled magnetic anisotropy in transition-metal thin films

2017-07-28T10:00:00-04:00

Author(s): Jia Zhang, Pavel V. Lukashev, Sitaram S. Jaswal, and Evgeny Y. Tsymbal
Voltage-controlled magnetic anisotropy (VCMA) is an efficient way to manipulate the magnetization states in nanomagnets and is promising for low-power spintronic applications. The underlying physical mechanism for VCMA is known to involve a change in the d orbital occupation on the transition-metal ...
[Phys. Rev. B 96, 014435] Published Fri Jul 28, 2017



Dynamics of nonergodic ferromagnetic/antiferromagnetic ordering and magnetocalorics in antiperovskite Mn_{3}SnC

2017-07-28T10:00:00-04:00

Author(s): Ö. Çakır, F. Cugini, M. Solzi, K. Priolkar, M. Acet, and M. Farle
We investigated the time dependence of the magnetic configuration at the mixed magnetic magnetostructural transition in Mn_{3}SnC. The nonergodic nature of the transition involves the stabilization of a final magnetic configuration that involves additional AF ordering which is not present when the t...
[Phys. Rev. B 96, 014436] Published Fri Jul 28, 2017



Magnetic properties of the CrMnFeCoNi high-entropy alloy

2017-07-28T10:00:00-04:00

Author(s): Oldřich Schneeweiss, Martin Friák, Marie Dudová, David Holec, Mojmír Šob, Dominik Kriegner, Václav Holý, Přemysl Beran, Easo P. George, Jörg Neugebauer, and Antonín Dlouhý
We present experimental data showing that the equiatomic CrMnFeCoNi high-entropy alloy undergoes two magnetic transformations at temperatures below 100 K while maintaining its fcc structure down to 3 K. The first transition, paramagnetic to spin glass, was detected at 93 K and the second transition ...
[Phys. Rev. B 96, 014437] Published Fri Jul 28, 2017



Reciprocal excitation of propagating spin waves by a laser pulse and their reciprocal mapping in magnetic metal films

2017-07-28T10:00:00-04:00

Author(s): A. Kamimaki, S. Iihama, Y. Sasaki, Y. Ando, and S. Mizukami
Focused pulse-laser-induced propagating magnetostatic surface spin waves (MSSWs) were investigated using an all-optical space-time-resolved magneto-optical Kerr effect microscope in 20-nm-thick permalloy thin films to clarify reciprocity and symmetry of MSSW emission. The microscope setup was constr...
[Phys. Rev. B 96, 014438] Published Fri Jul 28, 2017



Spiral spin state with open boundary conditions in a magnetic field

2017-07-28T10:00:00-04:00

Author(s): Randy S. Fishman and Satoshi Okamoto
In order to model a spiral spin state in a thin film, we study a classical Heisenberg model with open boundary conditions. With magnetic field applied in the plane of the film, the spin state becomes ferromagnetic above a critical field that increases with thickness N. For a given N, the spiral pass...
[Phys. Rev. B 96, 014439] Published Fri Jul 28, 2017



Role of multiorbital effects in the magnetic phase diagram of iron pnictides

2017-07-28T10:00:00-04:00

Author(s): Morten H. Christensen, Daniel D. Scherer, Panagiotis Kotetes, and Brian M. Andersen
We elucidate the pivotal role of the band structure's orbital content in deciding the type of commensurate magnetic order stabilized within the itinerant scenario of iron pnictides. Recent experimental findings in the tetragonal magnetic phase attest to the existence of the so-called charge and spin...
[Phys. Rev. B 96, 014523] Published Fri Jul 28, 2017



Dimensional reduction by pressure in the magnetic framework material CuF_{2}(D_{2}O)_{2}(pyz): From spin-wave to spinon excitations

2017-07-28T10:00:00-04:00

Author(s): M. Skoulatos, M. Månsson, C. Fiolka, K. W. Krämer, J. Schefer, J. S. White, and Ch. Rüegg
Metal organic magnets have enormous potential to host a variety of electronic and magnetic phases that originate from a strong interplay between the spin, orbital, and lattice degrees of freedom. We control this interplay in the quantum magnet CuF_{2}(D_{2}O)_{2}(pyz) by using high pressure to drive...
[Phys. Rev. B 96, 020414(R)] Published Fri Jul 28, 2017



Controlling topological superconductivity by magnetization dynamics

2017-07-28T10:00:00-04:00

Author(s): Vardan Kaladzhyan, Pascal Simon, and Mircea Trif
We study theoretically a chain of precessing classical magnetic impurities in an s-wave superconductor. Utilizing a rotating wave description, we derive an effective Hamiltonian that describes the emergent Shiba band. We find that this Hamiltonian shows nontrivial topological properties, and we obta...
[Phys. Rev. B 96, 020507(R)] Published Fri Jul 28, 2017



Super-Klein tunneling of massive pseudospin-one particles

2017-07-28T10:00:00-04:00

Author(s): Y. Betancur-Ocampo, G. Cordourier-Maruri, V. Gupta, and R. de Coss
The transmission properties of massive particles with pseudospin-one through homogeneous and heterogeneous junctions are studied from an effective spin-orbit Hamiltonian. The addition of a mass term in the Hamiltonian creates an energy band gap with a flat band inside the gap. There are three possib...
[Phys. Rev. B 96, 024304] Published Fri Jul 28, 2017



J_{1}−J_{2}

2017-07-28T10:00:00-04:00

Author(s): L. Yang, M. Jeong, P. Babkevich, V. M. Katukuri, B. Náfrádi, N. E. Shaik, A. Magrez, H. Berger, J. Schefer, E. Ressouche, M. Kriener, I. Živković, O. V. Yazyev, L. Forró, and H. M. Rønnow
We report magnetic and thermodynamic properties of a 4d^{1} (Mo^{5+}) magnetic insulator MoOPO_{4} single crystal, which realizes a J_{1}−J_{2} Heisenberg spin-1/2 model on a stacked square lattice. The specific-heat measurements show a magnetic transition at 16 K which is also confirmed by magnetic...
[Phys. Rev. B 96, 024445] Published Fri Jul 28, 2017



Spin wave modes in out-of-plane magnetized nanorings

2017-07-28T10:00:00-04:00

Author(s): X. Zhou, E. V. Tartakovskaya, G. N. Kakazei, and A. O. Adeyeye
We investigated the spin wave modes in flat circular permalloy rings with a canted external bias field using ferromagnetic resonance spectroscopy. The external magnetic field H was large enough to saturate the samples. For θ=0^{∘} (perpendicular geometry), three distinct resonance peaks were observe...
[Phys. Rev. B 96, 024446] Published Fri Jul 28, 2017



Intermixing enables strong exchange coupling in nanocomposites: Magnetism through the interfacial ferrite in γ−Fe_{2}O_{3}/NiO

2017-07-28T10:00:00-04:00

Author(s): E. Skoropata, T. T. Su, H. Ouyang, J. W. Freeland, and J. van Lierop
γ−Fe_{2}O_{3} particles, surface modified with NiO crystallites, form a unique nanocomposite that points to how to tune strong interfacial exchange coupling. We find that Ni^{2+} migrates into the octahedral sites of the γ−Fe_{2}O_{3} nanoparticle surface, and this NiFe_{2}O_{4}-like layer permits e...
[Phys. Rev. B 96, 024447] Published Fri Jul 28, 2017



Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

2017-07-28T10:00:00-04:00

Author(s): Kevin S. Olsson, Kyongmo An, Xin Ma, Sean Sullivan, Vijay Venu, Maxim Tsoi, Jianshi Zhou, Li Shi, and Xiaoqin Li
In the field of spin caloritronics, knowledge of the magnon temperature is crucial. We investigate the temperature sensing capabilities of Brillouin light scattering (BLS), a technique which is commonly used in studying magnons. The magnon BLS spectra are characterized by three parameters: peak freq...
[Phys. Rev. B 96, 024448] Published Fri Jul 28, 2017



Streaming flow due to a quartz tuning fork oscillating in normal and superfluid ^{4}He

2017-07-28T10:00:00-04:00

Author(s): D. Duda, M. La Mantia, and L. Skrbek
We visualize the streaming flow due to a rapidly oscillating quartz tuning fork, in both normal He I and superfluid He II, by following the flow-induced motions of relatively small particles suspended in the liquid. Over the investigated temperature range, between 1.2 and 2.3 K, at the experimentall...
[Phys. Rev. B 96, 024519] Published Fri Jul 28, 2017



Diagrammatic Monte Carlo approach for diagrammatic extensions of dynamical mean-field theory: Convergence analysis of the dual fermion technique

2017-07-28T10:00:00-04:00

Author(s): Jan Gukelberger, Evgeny Kozik, and Hartmut Hafermann
The dual fermion approach provides a formally exact prescription for calculating properties of a correlated electron system in terms of a diagrammatic expansion around dynamical mean-field theory (DMFT). Most practical implementations, however, neglect higher-order interaction vertices beyond two-pa...
[Phys. Rev. B 96, 035152] Published Fri Jul 28, 2017



Numerical treatment of spin systems with unrestricted spin length S: A functional renormalization group study

2017-07-28T10:00:00-04:00

Author(s): M. L. Baez and J. Reuther
We develop a generalized pseudofermion functional renormalization group (PFFRG) approach that can be applied to arbitrary Heisenberg models with spins ranging from the quantum case S=1/2 to the classical limit S→∞. Within this framework, spins of magnitude S are realized by implementing M=2S copies ...
[Phys. Rev. B 96, 045144] Published Fri Jul 28, 2017



Fine structure of excitons in InAs quantum dots on GaAs(110) planar layers and nanowire facets

2017-07-28T10:00:00-04:00

Author(s): Pierre Corfdir, Ryan B. Lewis, Lutz Geelhaar, and Oliver Brandt
We investigate the optical properties of InAs quantum dots grown by molecular beam epitaxy on GaAs(110) using Bi as a surfactant. The quantum dots are synthesized on planar GaAs(110) substrates as well as on the {110} sidewall facets of GaAs nanowires. At 10 K, neutral excitons confined in these qua...
[Phys. Rev. B 96, 045435] Published Fri Jul 28, 2017



Quantum electron transport in magnetically entangled subbands

2017-07-28T10:00:00-04:00

Author(s): William Mayer, Sergey Vitkalov, and A. A. Bykov
Transport properties of highly mobile two-dimensional (2D) electrons in symmetric GaAs quantum wells with two populated subbands placed in tilted magnetic fields are studied at high temperatures. Quantum positive magnetoresistance (QPMR) and magneto-intersubband resistance oscillations (MISO) are ob...
[Phys. Rev. B 96, 045436] Published Fri Jul 28, 2017



Direct observation of multivalent states and 4f→3d charge transfer in Ce-doped yttrium iron garnet thin films

2017-07-27T10:00:00-04:00

Author(s): H. B. Vasili, B. Casals, R. Cichelero, F. Macià, J. Geshev, P. Gargiani, M. Valvidares, J. Herrero-Martin, E. Pellegrin, J. Fontcuberta, and G. Herranz
Due to their large magneto-optic responses, rare-earth-doped yttrium iron garnets, Y_{3}Fe_{5}O_{12} (YIG), are highly regarded for their potential in photonics and magnonics. Here, we consider the case of Ce-doped YIG (Ce-YIG) thin films, in which substitutional Ce^{3+} ions are magnetic because of...
[Phys. Rev. B 96, 014433] Published Thu Jul 27, 2017



Suppression of magnetism in Ba_{5}AlIr_{2}O_{11}: Interplay of Hund's coupling, molecular orbitals, and spin-orbit interaction

2017-07-27T10:00:00-04:00

Author(s): Sergey V. Streltsov, Gang Cao, and Daniel I. Khomskii
The electronic and magnetic properties of Ba_{5}AlIr_{2}O_{11} containing Ir-Ir dimers are investigated using the generalized gradient approximation (GGA) and GGA + spin-orbit coupling (SOC) calculations. We found that the strong suppression of the magnetic moment in this compound recently found by ...
[Phys. Rev. B 96, 014434] Published Thu Jul 27, 2017



Domain walls in a chiral d-wave superconductor on the honeycomb lattice

2017-07-27T10:00:00-04:00

Author(s): Oladunjoye A. Awoga, Adrien Bouhon, and Annica M. Black-Schaffer
We perform a fully self-consistent study of domain walls between different chiral domains in chiral d_{x^{2}−y^{2}}±id_{xy}-wave superconductors with an underlying honeycomb lattice structure. We investigate domain walls along all possible armchair and zigzag directions and with a finite global phas...
[Phys. Rev. B 96, 014521] Published Thu Jul 27, 2017



Transformation of the superconducting gap to an insulating pseudogap at a critical hole density in the cuprates

2017-07-27T10:00:00-04:00

Author(s): Ye-Hua Liu, Wan-Sheng Wang, Qiang-Hua Wang, Fu-Chun Zhang, and T. M. Rice
We apply the recent wave-packet formalism developed by Ossadnik to describe the origin of the short-range ordered pseudogap state as the hole doping is lowered through a critical density in cuprates. We argue that the energy gain that drives this precursor state to Mott localization, follows from ma...
[Phys. Rev. B 96, 014522] Published Thu Jul 27, 2017



Modulations of interlayer exchange coupling through ultrathin MgO-based magnetic tunnel junctions: First-principles study

2017-07-27T10:00:00-04:00

Author(s): Shizhuo Wang, Ke Xia, Tai Min, and Youqi Ke
Ultrathin MgO-based magnetic tunnel junction (MTJ) features high electron/heat current density, presenting important applications in spintronics. Here, we report a first-principles study of the interlayer exchange coupling (IEC) through ultrathin MgO-based MTJs. We investigate the effects of differe...
[Phys. Rev. B 96, 024443] Published Thu Jul 27, 2017



Magnon-induced nuclear relaxation in the quantum critical region of a Heisenberg linear chain

2017-07-27T10:00:00-04:00

Author(s): M. J. R. Hoch
The low-temperature properties of spin-1/2 one-dimensional (1D) Heisenberg antiferromagnetic (HAF) chains which have relatively small exchange couplings between the spins can be tuned using laboratory-scale magnetic fields. Magnetization measurements, made as a function of temperature, provide phase...
[Phys. Rev. B 96, 024444] Published Thu Jul 27, 2017



High-T_{c} superconductivity in weakly electron-doped HfNCl

2017-07-27T10:00:00-04:00

Author(s): Betül Pamuk, Francesco Mauri, and Matteo Calandra
We investigate the magnetic and superconducting properties in electron-doped Li_{x}HfNCl. HfNCl is a band insulator that undergoes an insulator to superconductor transition upon doping at x≈0.13. The persistence of the insulating state for x<0.13 is due to an Anderson transition probably related to Li disorder. In the metallic and superconducting phase, Li_{x}HfNCl is a prototype two-dimensional two-valley electron gas with parabolic bands. By performing a model random phase approximation approach as well as first-principles range-separated Heyd-Scuseria-Ernzerhof (HSE06) calculations, we find that the spin susceptibility χ_{s} is strongly enhanced in the low-doping regime by the electron-electron interaction. Furthermore, in the low-doping limit, the exchange interaction renormalizes the intervalley electron-phonon coupling and results in a strong increase of the superconducting critical temperature for x<0.15. On the contrary, for x>0.15, T_{c} is approximately constant, in agreement with ex...
[Phys. Rev. B 96, 024518] Published Thu Jul 27, 2017



Robustness of symmetry-protected topological states against time-periodic perturbations

2017-07-27T10:00:00-04:00

Author(s): Oleksandr Balabanov and Henrik Johannesson
The existence of gapless boundary states is a key attribute of any topological insulator. Topological band theory predicts that these states are robust against static perturbations that preserve the relevant symmetries. In this article, using Floquet theory, we examine how chiral symmetry protection...
[Phys. Rev. B 96, 035149] Published Thu Jul 27, 2017



Evidence of a fractional quantum Hall nematic phase in a microscopic model

2017-07-27T10:00:00-04:00

Author(s): N. Regnault, J. Maciejko, S. A. Kivelson, and S. L. Sondhi

The fractional quantum Hall (FQH) nematic state is a conjectured state of matter in which FQH topological order coexists with spontaneously broken rotation symmetry. Recent experiments on GaAs quantum wells suggest this state, as well as the concomitant isotropic-nematic phase transition, may be realized in a two-dimensional electron gas at certain rational filling factors. Although effective field theories of the FQH nematic state have been constructed, there has been so far no explicit realization of this state as the ground state of a microscopic model of interacting electrons. The authors show via a variational approach and numerical exact diagonalization that tuning Haldane pseudopotentials in a model of interacting electrons in the lowest Landau level induces a quantum phase transition out of the isotropic Laughlin FQH liquid and into the FQH nematic state.

(image)
[Phys. Rev. B 96, 035150] Published Thu Jul 27, 2017



Experimental observation of temperature and magnetic-field evolution of the 4f states in CeFe_{2} revealed by soft x-ray magnetic circular dichroism

2017-07-27T10:00:00-04:00

Author(s): Y. Saitoh, A. Yasui, H. Fuchimoto, Y. Nakatani, H. Fujiwara, S. Imada, Y. Narumi, K. Kindo, M. Takahashi, T. Ebihara, and A. Sekiyama
We revisit the delocalized character of the 4f states of CeFe_{2} in the ferromagnetically ordered phase by x-ray magnetic circular dichroism (XMCD) in x-ray absorption spectroscopy (XAS) with improved data quality using single crystals. Surprisingly, the Ce M_{4,5} XMCD spectral shape changes signi...
[Phys. Rev. B 96, 035151] Published Thu Jul 27, 2017



Nonlinear optical conductivity resulting from the local energy spectrum at the M point in graphene

2017-07-27T10:00:00-04:00

Author(s): Zheng Liu, Chao Zhang, and J. C. Cao
Based on the tight-binding model we construct a nonlinear Hamiltonian to describe the effective electric system around the M point for the single layer graphene. The local energy spectrum at the M point is approximated by the perfect hyperbolic geometry, and the modification by the screening effect ...
[Phys. Rev. B 96, 035206] Published Thu Jul 27, 2017



Geometric vector potentials from nonadiabatic spin dynamics

2017-07-27T10:00:00-04:00

Author(s): J. P. Baltanás, H. Saarikoski, A. A. Reynoso, and D. Frustaglia
We propose a theoretical framework that captures the geometric vector potential emerging from the nonadiabatic spin dynamics of itinerant carriers subject to arbitrary magnetic textures. Our approach results in a series of constraints on the geometric potential and the nonadiabatic geometric phase a...
[Phys. Rev. B 96, 035312] Published Thu Jul 27, 2017



Local field enhancement and thermoplasmonics in multimodal aluminum structures

2017-07-27T10:00:00-04:00

Author(s): Peter R. Wiecha, Marie-Maxime Mennemanteuil, Dmitry Khlopin, Jérôme Martin, Arnaud Arbouet, Davy Gérard, Alexandre Bouhelier, Jérôme Plain, and Aurélien Cuche
Aluminum nanostructures have recently been at the focus of numerous studies due to their properties including oxidation stability and surface plasmon resonances covering the ultraviolet and visible spectral windows. In this article, we reveal a facet of this metal relevant for both plasmonic purpose...
[Phys. Rev. B 96, 035440] Published Thu Jul 27, 2017



Robustness of error-suppressing entangling gates in cavity-coupled transmon qubits

2017-07-27T10:00:00-04:00

Author(s): Xiu-Hao Deng, Edwin Barnes, and Sophia E. Economou
Superconducting transmon qubits comprise one of the most promising platforms for quantum information processing due to their long coherence times and to their scalability into larger qubit networks. However, their weakly anharmonic spectrum leads to spectral crowding in multiqubit systems, making it...
[Phys. Rev. B 96, 035441] Published Thu Jul 27, 2017



Semiclassics for matrix Hamiltonians: The Gutzwiller trace formula with applications to graphene-type systems

2017-07-27T10:00:00-04:00

Author(s): M. Vogl, O. Pankratov, and S. Shallcross
We present a tractable and physically transparent semiclassical theory of matrix-valued Hamiltonians, i.e., those that describe quantum systems with internal degrees of freedoms, based on a generalization of the Gutzwiller trace formula for a n×n dimensional Hamiltonian H(p[over ̂],q[over ̂]). The c...
[Phys. Rev. B 96, 035442] Published Thu Jul 27, 2017



Erratum: Entanglement structure of the Hubbard model in momentum space [Phys. Rev. B 92, 235116 (2015)]

2017-07-27T10:00:00-04:00

Author(s): G. Ehlers, J. Sólyom, Ö. Legeza, and R. M. Noack

[Phys. Rev. B 96, 039906] Published Thu Jul 27, 2017



Role of finite-size effects in the critical behavior of itinerant fermions

2017-07-27T10:00:00-04:00

Author(s): Avraham Klein and Andrey Chubukov
We study the role of finite-size effects on critical behavior near a metallic q=0 critical point and compare the results with a recent extensive quantum Monte Carlo (QMC) study [Y. Schattner et al., Phys. Rev. X 6, 031028 (2016)]. This study found several features in both bosonic and fermionic resp...
[Phys. Rev. B 96, 041125(R)] Published Thu Jul 27, 2017



Emergent Weyl nodes and Fermi arcs in a Floquet Weyl semimetal

2017-07-27T10:00:00-04:00

Author(s): Leda Bucciantini, Sthitadhi Roy, Sota Kitamura, and Takashi Oka
When a Dirac semimetal is subject to a circularly polarized laser, it is predicted that the Dirac cone splits into two Weyl nodes and a nonequilibrium transient state called the Floquet Weyl semimetal is realized. We focus on the previously unexplored low-frequency regime, where the upper and lower ...
[Phys. Rev. B 96, 041126(R)] Published Thu Jul 27, 2017



Simulations of twisted bilayer orthorhombic black phosphorus

2017-07-27T10:00:00-04:00

Author(s): Douxing Pan, Tzu-Chiang Wang, Wende Xiao, Dongmei Hu, and Yugui Yao
We identified, by means of coincidence site lattice theory, an evaluative stacking phase with a wavelike Moiré pattern, denoted as 2O−tαP, from all potentially twisted bilayer orthorhombic black phosphorus. Such a twisted stacking comes with a low formation energy of −162.8meV, very close to existin...
[Phys. Rev. B 96, 041411(R)] Published Thu Jul 27, 2017



Indicators of conformal field theory: Entanglement entropy and multiple-point correlators

2017-07-27T10:00:00-04:00

Author(s): Pranay Patil, Ying Tang, Emanuel Katz, and Anders W. Sandvik
The entanglement entropy (EE) of quantum systems is often used as a test of low-energy descriptions by conformal field theory (CFT). Here we point out that this is not a reliable indicator, as the EE often shows the same behavior even when a CFT description is not correct (as long as the system is a...
[Phys. Rev. B 96, 045140] Published Thu Jul 27, 2017



Low-temperature microwave properties of biaxial YAlO_{3}

2017-07-27T10:00:00-04:00

Author(s): N. C. Carvalho, M. Goryachev, J. Krupka, P. Bushev, and M. E. Tobar
Low-loss crystals with defects due to paramagnetic or rare earth impurity ions are a major area of investigation for quantum hybrid systems at both optical and microwave frequencies. In this work we examine the single-crystal yttrium aluminium perovskite YAlO_{3} using the whispering gallery mode te...
[Phys. Rev. B 96, 045141] Published Thu Jul 27, 2017



Gauge-including projector augmented-wave NMR chemical shift calculations with DFT+U

2017-07-27T10:00:00-04:00

Author(s): Bi-Ching Shih and Jonathan R. Yates
We adapt the DFT+U method in the gauge-including projector augmented-wave NMR chemical shift calculations within the plane wave pseudopotential implementation. The nonlocal Hubbard correction potential has been reexamined in order to comply with the gauge-including projector augmented-wave transform...
[Phys. Rev. B 96, 045142] Published Thu Jul 27, 2017



Strong-disorder approach for the Anderson localization transition

2017-07-27T10:00:00-04:00

Author(s): H. Javan Mard, José A. Hoyos, E. Miranda, and V. Dobrosavljević
We propose a strong-disorder renormalization-group approach to study the Anderson localization transition in disordered tight-binding models in any dimension. Our approach shifts the focus from the lower to the upper critical dimension, thus emphasizing the strong-coupling/strong-disorder nature of ...
[Phys. Rev. B 96, 045143] Published Thu Jul 27, 2017



Collective two-boson decay of excitons in a Bose-Einstein condensate and generation of coherent photon-phonon radiation

2017-07-27T10:00:00-04:00

Author(s): H. K. Avetissian, A. K. Avetissian, G. F. Mkrtchian, and B. R. Avchyan
The collective decay of excitons from initial Bose-Einstein condensate state is investigated theoretically. As a practically more interesting case we consider excitons of the yellow series in the semiconductor cuprous oxide where we have collective photon and phonon-assisted decay of excitons. It is...
[Phys. Rev. B 96, 045206] Published Thu Jul 27, 2017



Coexistence of bulk and surface states probed by Shubnikov–de Haas oscillations in Bi_{2}Se_{3} with high charge-carrier density

2017-07-27T10:00:00-04:00

Author(s): E. K. de Vries, S. Pezzini, M. J. Meijer, N. Koirala, M. Salehi, J. Moon, S. Oh, S. Wiedmann, and T. Banerjee
Topological insulators are ideally represented as having an insulating bulk with topologically protected, spin-textured surface states. However, it is increasingly becoming clear that these surface transport channels can be accompanied by a finite conducting bulk, as well as additional topologically...
[Phys. Rev. B 96, 045433] Published Thu Jul 27, 2017



Electronic structure changes during the on-surface synthesis of nitrogen-doped chevron-shaped graphene nanoribbons

2017-07-27T10:00:00-04:00

Author(s): Friedrich Maaß, Manuel Utecht, Stephan Stremlau, Marie Gille, Jutta Schwarz, Stefan Hecht, Tillmann Klamroth, and Petra Tegeder
Utilizing suitable precursor molecules, a thermally activated and surface-assisted synthesis results in the formation of defect-free graphene nanoribbons (GNRs), which exhibit electronic properties that are not present in extended graphene. Most importantly, they have a band gap in the order of a fe...
[Phys. Rev. B 96, 045434] Published Thu Jul 27, 2017



Accurate and precise ab initio anharmonic free-energy calculations for metallic crystals: Application to hcp Fe at high temperature and pressure

2017-07-26T10:00:00-04:00

Author(s): Sabry G. Moustafa, Andrew J. Schultz, Eva Zurek, and David A. Kofke
A framework for computing the anharmonic free energy (FE) of metallic crystals using Born-Oppenheimer ab initio molecular dynamics (AIMD) simulation, with unprecedented efficiency, is introduced and demonstrated for the hcp phase of iron at extreme conditions (up to ≈290 GPa and 5000 K). The advance...
[Phys. Rev. B 96, 014117] Published Wed Jul 26, 2017



Putative spin liquid in the triangle-based iridate Ba_{3}IrTi_{2}O_{9}

2017-07-26T10:00:00-04:00

Author(s): W.-J. Lee, S.-H. Do, Sungwon Yoon, S. Lee, Y. S. Choi, D. J. Jang, M. Brando, M. Lee, E. S. Choi, S. Ji, Z. H. Jang, B. J. Suh, and K.-Y. Choi
We report on thermodynamic, magnetization, and muon spin relaxation measurements of the strong spin-orbit coupled iridate Ba_{3}IrTi_{2}O_{9}, which constitutes a distinct frustration motif made up of a mixture of edge- and corner-sharing triangles. In spite of a strong antiferromagnetic exchange in...
[Phys. Rev. B 96, 014432] Published Wed Jul 26, 2017



Effect of magnetic field and Rashba spin-orbit interaction on the Josephson tunneling between superconducting nanowires

2017-07-26T10:00:00-04:00

Author(s): E. Nakhmedov, O. Alekperov, F. Tatardar, Yu. M. Shukrinov, I. Rahmonov, and K. Sengupta
We calculate the Josephson current between two one-dimensional (1D) nanowires oriented along x with proximity induced s-wave superconducting pairing and separated by a narrow dielectric barrier in the presence of both Rashba spin-orbit interaction (SOI) characterized by strength α and Zeeman fields ...
[Phys. Rev. B 96, 014519] Published Wed Jul 26, 2017



Complex biphase nature of the superconducting dome of the FeSe phase diagram

2017-07-26T10:00:00-04:00

Author(s): V. Svitlyk, M. Raba, V. Dmitriev, P. Rodière, P. Toulemonde, D. Chernyshov, and M. Mezouar
Single crystal synchrotron x-ray diffraction as a function of temperature and pressure has revealed a complex biphase mixture in superconducting FeSe. Based on our experimental results, we construct a phase diagram where structural behavior and superconducting properties of FeSe are found to be corr...
[Phys. Rev. B 96, 014520] Published Wed Jul 26, 2017



Valley-contrasting physics in all-dielectric photonic crystals: Orbital angular momentum and topological propagation

2017-07-26T10:00:00-04:00

Author(s): Xiao-Dong Chen, Fu-Li Zhao, Min Chen, and Jian-Wen Dong
The valley has been exploited as a binary degree of freedom to realize valley-selective Hall transport and circular dichroism in two-dimensional layered materials, in which valley-contrasting physics is indispensable in making the valley index an information carrier. In this Rapid Communication, we ...
[Phys. Rev. B 96, 020202(R)] Published Wed Jul 26, 2017



Doping a dipole into an incipient ferroelectric: Route to relaxor ferroelectrics

2017-07-26T10:00:00-04:00

Author(s): N. Vijay Prakash Chaudhary, Sagar Sarkar, Neetika Sharma, Asish K. Kundu, Krishnakumar S. R. Menon, A. Das, Priya Mahadevan, and A. Venimadhav
TiO_{2} in the rutile phase is known to be an incipient ferroelectric. Considering Nb-Cr codoping we examine if ferroelectricity can be induced at the low doping limit in Ti_{(1−x)}(Nb_{0.5}Cr_{0.5})_{x}O_{2} (x=0.05%, 1%, 5%, and 10%). A relaxor behavior is found in the temperature range 20–120 K w...
[Phys. Rev. B 96, 024107] Published Wed Jul 26, 2017



Ultrafast dynamics in ferrimagnetic materials with a quantum Monte Carlo atomistic model

2017-07-26T10:00:00-04:00

Author(s): O. Morandi and P.-A. Hervieux
We investigate the ultrafast dynamics of the atomic angular momentum in ferrimagnets irradiated by laser pulses. Our study is based on a quantum atomistic approach and the particle dynamics is performed using a Monte Carlo technique. We focus on microscopic mechanisms that lead to the dissipation of...
[Phys. Rev. B 96, 024441] Published Wed Jul 26, 2017



Competing Bose-glass physics with disorder-induced Bose-Einstein condensation in the doped S=1 antiferromagnet Ni(Cl_{1−x}Br_{x})_{2}−4SC(NH_{2})_{2} at high magnetic fields

2017-07-26T10:00:00-04:00

Author(s): Maxime Dupont, Sylvain Capponi, Mladen Horvatić, and Nicolas Laflorencie
We study the interplay between disorder and interactions for emergent bosonic degrees of freedom induced by an external magnetic field in the Br-doped spin-gapped antiferromagnetic material Ni(Cl_{1−x}Br_{x})_{2}−4SC(NH_{2})_{2} (DTNX). Building on nuclear magnetic resonance experiments at high magn...
[Phys. Rev. B 96, 024442] Published Wed Jul 26, 2017



Josephson effect in multiterminal topological junctions

2017-07-26T10:00:00-04:00

Author(s): A. Zazunov, R. Egger, M. Alvarado, and A. Levy Yeyati
We study the Josephson effect in a trijunction formed by two topological superconductor (TS) wires and a conventional s-wave superconductor. Using a boundary Green's function formalism, analytical results for the current-phase relation are obtained in various limiting cases by modeling the TS wires ...
[Phys. Rev. B 96, 024516] Published Wed Jul 26, 2017



Static and dynamic properties of Josephson weak links with singlet and triplet coupling

2017-07-26T10:00:00-04:00

Author(s): Andreas Moor and Anatoly F. Volkov
We theoretically study static and dynamic properties of short Josephson junctions (JJs) with singlet and triplet Josephson coupling. In singlet Josephson weak links, two singlet superconductors S are connected with each other by a normal film (N) or wire. Triplet JJs, which we denote S_{m}-N(F)-S_{m...
[Phys. Rev. B 96, 024517] Published Wed Jul 26, 2017



Thermal expansion coefficient of WRe alloys from first principles

2017-07-26T10:00:00-04:00

Author(s): Thomas Dengg, Vsevolod Razumovskiy, Lorenz Romaner, Georg Kresse, Peter Puschnig, and Jürgen Spitaler
We calculate the coefficient of thermal expansion (CTE) in tungsten-rhenium random alloys for Re concentrations between 0% and 50% and for temperatures up to 2400 K by employing the quasiharmonic approximation within the ab initio framework of density functional theory. We treat chemical disorder by...
[Phys. Rev. B 96, 035148] Published Wed Jul 26, 2017



Valence band energy spectrum of HgTe quantum wells with an inverted band structure

2017-07-26T10:00:00-04:00

Author(s): G. M. Minkov, V. Ya. Aleshkin, O. E. Rut, A. A. Sherstobitov, A. V. Germanenko, S. A. Dvoretski, and N. N. Mikhailov
The energy spectrum of the valence band in HgTe/Cd_{x}Hg_{1−x}Te quantum wells of a width (8–20) nm has been studied experimentally by magnetotransport effects and theoretically in the framework of a four-band kP method. Comparison of the Hall density with the density found from a period of the Shub...
[Phys. Rev. B 96, 035310] Published Wed Jul 26, 2017



Atomic-scale structural and electronic properties of SrTiO_{3}/GaAs interfaces: A combined STEM-EELS and first-principles study

2017-07-26T10:00:00-04:00

Author(s): Liang Hong, Kunal Bhatnagar, Ravi Droopad, Robert F. Klie, and Serdar Öğüt
The electronic properties of epitaxial oxide thin films grown on compound semiconductors are largely determined by the interfacial atomic structure, as well as the thermodynamic conditions during synthesis. Ferroelectric polarization and Fermi-level pinning in SrTiO_{3} films have been attributed to...
[Phys. Rev. B 96, 035311] Published Wed Jul 26, 2017



Chirality blockade of Andreev reflection in a magnetic Weyl semimetal

2017-07-26T10:00:00-04:00

Author(s): N. Bovenzi, M. Breitkreiz, P. Baireuther, T. E. O'Brien, J. Tworzydło, İ. Adagideli, and C. W. J. Beenakker

Conduction electrons in Weyl semimetals move as massless relativistic particles with a definite chirality, meaning that the spin points parallel or antiparallel to the momentum. Such a spin-momentum locking allows for a mechanism to control Cooper-pair transfer at the interface between a magnetic Weyl semimetal and a superconductor. The authors demonstrate that Andreev reflection is fully suppressed when the internal magnetization lies in the plane of the interface. External magnetic field can activate Andreev reflection by relaxing the requirement of zero-spin transfer into the superconductor. The chiralityblockade that the team has discovered provides a phase-insensitive mechanism to control supercurrent. It is also the unique signature of a pseudoscalar superconducting pair potential.

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[Phys. Rev. B 96, 035437] Published Wed Jul 26, 2017



Single-layer group IV-V and group V-IV-III-VI semiconductors: Structural stability, electronic structures, optical properties, and photocatalysis

2017-07-26T10:00:00-04:00

Author(s): Jia-He Lin, Hong Zhang, Xin-Lu Cheng, and Yoshiyuki Miyamoto
Recently, single-layer group III monochalcogenides have attracted both theoretical and experimental interest at their potential applications in photonic devices, electronic devices, and solar energy conversion. Excited by this, we theoretically design two kinds of highly stable single-layer group IV...
[Phys. Rev. B 96, 035438] Published Wed Jul 26, 2017



Revisiting the effective medium approximation in all-dielectric subwavelength multilayers: Breakdown and rebuilding

2017-07-26T10:00:00-04:00

Author(s): Xinrui Lei, Lei Mao, Yonghua Lu, and Pei Wang
Here, we present a comprehensive analysis of the effective medium approximation (EMA) breakdown in all-dielectric deep-subwavelength multilayers made of alternating layers by means of the transfer matrix method. We demonstrated that the approximation is invalid at the vicinity of the effective mediu...
[Phys. Rev. B 96, 035439] Published Wed Jul 26, 2017



Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: Photon echo versus double quantum coherence

2017-07-26T10:00:00-04:00

Author(s): Valentin Delmonte, Judith F. Specht, Tomasz Jakubczyk, Sven Höfling, Martin Kamp, Christian Schneider, Wolfgang Langbein, Gilles Nogues, Marten Richter, and Jacek Kasprzak
We employ two-dimensional (2D) coherent, nonlinear spectroscopy to investigate couplings within individual InAs quantum dots (QDs) and QD molecules. Swapping pulse ordering in a two-beam sequence permits one to distinguish between rephasing and nonrephasing four-wave mixing (FWM) configurations. We ...
[Phys. Rev. B 96, 041124(R)] Published Wed Jul 26, 2017



Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures

2017-07-26T10:00:00-04:00

Author(s): Bowen Yang, Mark Lohmann, David Barroso, Ingrid Liao, Zhisheng Lin, Yawen Liu, Ludwig Bartels, Kenji Watanabe, Takashi Taniguchi, and Jing Shi
Despite its extremely weak intrinsic spin-orbit coupling (SOC), graphene has been shown to acquire considerable SOC by proximity coupling with exfoliated transition metal dichalcogenides (TMDs). Here we demonstrate strong induced Rashba SOC in graphene that is proximity coupled to a monolayer TMD fi...
[Phys. Rev. B 96, 041409(R)] Published Wed Jul 26, 2017



Voltage-controllable colossal magnetocrystalline anisotropy in single-layer transition metal dichalcogenides

2017-07-26T10:00:00-04:00

Author(s): Xuelei Sui, Tao Hu, Jianfeng Wang, Bing-Lin Gu, Wenhui Duan, and Mao-sheng Miao
Materials with large magnetocrystalline anisotropy and strong electric field effects are highly needed to develop new types of memory devices based on electric field control of spin orientations. Instead of using modified transition metal films, we propose that certain monolayer transition metal dic...
[Phys. Rev. B 96, 041410(R)] Published Wed Jul 26, 2017



Pressure dependence of dynamically screened Coulomb interactions in NiO: Effective Hubbard, Hund, intershell, and intersite components

2017-07-26T10:00:00-04:00

Author(s): S. K. Panda, H. Jiang, and S. Biermann
In this work, we report the pressure dependence of the effective Coulomb interaction parameters (Hubbard U) in paramagnetic NiO within the constrained random phase approximation (cRPA). We consider five different low-energy models starting from the most expensive one that treats both Ni-d and O-p st...
[Phys. Rev. B 96, 045137] Published Wed Jul 26, 2017



Critical eigenstates and their properties in one- and two-dimensional quasicrystals

2017-07-26T10:00:00-04:00

Author(s): Nicolas Macé, Anuradha Jagannathan, Pavel Kalugin, Rémy Mosseri, and Frédéric Piéchon
We present exact solutions for some eigenstates of hopping models on one- and two-dimensional quasiperiodic tilings and show that they are “critical” states, by explicitly computing their multifractal spectra. These eigenstates are shown to be generically present in 1D quasiperiodic chains, of which...
[Phys. Rev. B 96, 045138] Published Wed Jul 26, 2017



Quantum criticality and development of antiferromagnetic order in the quasikagome Kondo lattice CeRh_{1−x}Pd_{x}Sn

2017-07-26T10:00:00-04:00

Author(s): C. L. Yang, S. Tsuda, K. Umeo, Y. Yamane, T. Onimaru, T. Takabatake, N. Kikugawa, T. Terashima, and S. Uji
CeRhSn with a quasikagome lattice of Ce atoms in the hexagonal c plane has been expected to be in close vicinity to a zero-field quantum criticality derived from magnetic frustration. We have studied how the ground state changes with substitution of Pd for Rh in CeRh_{1−x}Pd_{x}Sn (x≤0.75) by measur...
[Phys. Rev. B 96, 045139] Published Wed Jul 26, 2017



Quantum transport in Weyl semimetal thin films in the presence of spin-orbit coupled impurities

2017-07-26T10:00:00-04:00

Author(s): Weizhe Edward Liu (刘玮哲), Ewelina M. Hankiewicz, and Dimitrie Culcer
Topological semimetals have been at the forefront of experimental and theoretical attention in condensed-matter physics. Among these, recently discovered Weyl semimetals have a dispersion described by a three-dimensional Dirac cone, which is at the root of exotic physics such as the chiral anomaly i...
[Phys. Rev. B 96, 045307] Published Wed Jul 26, 2017



Remote preparation of single-plasmon states

2017-07-26T10:00:00-04:00

Author(s): Marie-Christine Dheur, Benjamin Vest, Éloïse Devaux, Alexandre Baron, Jean-Paul Hugonin, Jean-Jacques Greffet, Gaétan Messin, and François Marquier
Quantum entanglement is a stunning consequence of the superposition principle. This universal property of quantum systems has been intensively explored with photons, atoms, ions, and electrons. Collective excitations such as surface plasmons exhibit quantum behaviors. We report the remote preparatio...
[Phys. Rev. B 96, 045432] Published Wed Jul 26, 2017



Ultrafast x-ray diffraction thermometry measures the influence of spin excitations on the heat transport through nanolayers

2017-07-25T10:00:00-04:00

Author(s): A. Koc, M. Reinhardt, A. von Reppert, M. Rössle, W. Leitenberger, K. Dumesnil, P. Gaal, F. Zamponi, and M. Bargheer
We investigate the heat transport through a rare earth multilayer system composed of yttrium (Y), dysprosium (Dy), and niobium (Nb) by ultrafast x-ray diffraction. This is an example of a complex heat flow problem on the nanoscale, where several different quasiparticles carry the heat and conserve a...
[Phys. Rev. B 96, 014306] Published Tue Jul 25, 2017



Quantum confinement: A route to enhance the Curie temperature of Mn doped GaAs

2017-07-25T10:00:00-04:00

Author(s): Basudeb Mandal, Hirak Kumar Chandra, Poonam Kumari, and Priya Mahadevan
The electronic structure of Mn doped GaAs and GaN have been examined within a multiband Hubbard model. By virtue of the positioning of the Mn d states, Mn doped GaAs is found to belong to the p−d metal regime of the Zaanen-Sawatzky-Allen phase diagram and its variants, while Mn doping in GaN belongs...
[Phys. Rev. B 96, 014430] Published Tue Jul 25, 2017



Exact diagonalization and cluster mean-field study of triangular-lattice XXZ antiferromagnets near saturation

2017-07-25T10:00:00-04:00

Author(s): Daisuke Yamamoto, Hiroshi Ueda, Ippei Danshita, Giacomo Marmorini, Tsutomu Momoi, and Tokuro Shimokawa
Quantum magnetic phases near the magnetic saturation of triangular-lattice antiferromagnets with XXZ anisotropy have been attracting renewed interest since it has been suggested that a nontrivial coplanar phase, called the π-coplanar or Ψ phase, could be stabilized by quantum effects in a certain ra...
[Phys. Rev. B 96, 014431] Published Tue Jul 25, 2017



Vortex lattice melting in a boson ladder in an artificial gauge field

2017-07-25T10:00:00-04:00

Author(s): E. Orignac, R. Citro, M. Di Dio, and S. De Palo
We consider a two-leg boson ladder in an artificial U(1) gauge field and show that, in the presence of interleg attractive interaction, the flux induced vortex state can be melted by dislocations. For increasing flux, instead of the Meissner to vortex transition in the commensurate-incommensurate un...
[Phys. Rev. B 96, 014518] Published Tue Jul 25, 2017



Majorana dynamical mean-field study of spin dynamics at finite temperatures in the honeycomb Kitaev model

2017-07-25T10:00:00-04:00

Author(s): Junki Yoshitake, Joji Nasu, Yasuyuki Kato, and Yukitoshi Motome
A prominent feature of quantum spin liquids is fractionalization of the spin degree of freedom. Fractionalized excitations have their own dynamics in different energy scales, and hence, affect finite-temperature (T) properties in a peculiar manner even in the paramagnetic state harboring the quantum...
[Phys. Rev. B 96, 024438] Published Tue Jul 25, 2017



Magnetic structure and dispersion relation of the S=1/2 quasi-one-dimensional Ising-like antiferromagnet BaCo_{2}V_{2}O_{8} in a transverse magnetic field

2017-07-25T10:00:00-04:00

Author(s): M. Matsuda, H. Onishi, A. Okutani, J. Ma, H. Agrawal, T. Hong, D. M. Pajerowski, J. R. D. Copley, K. Okunishi, M. Mori, S. Kimura, and M. Hagiwara
BaCo_{2}V_{2}O_{8} consists of Co chains in which a Co^{2+} ion carries a fictitious spin 1/2 with Ising anisotropy. We performed elastic and inelastic neutron scattering experiments in BaCo_{2}V_{2}O_{8} in a magnetic field perpendicular to the c axis which is the chain direction. With applying mag...
[Phys. Rev. B 96, 024439] Published Tue Jul 25, 2017



Room-temperature dilute ferromagnetic dislocations in Sr_{1−x}Mn_{x}TiO_{3−δ}

2017-07-25T10:00:00-04:00

Author(s): Ryo Ishikawa, Yoichi Shimbo, Issei Sugiyama, Nathan R. Lugg, Naoya Shibata, and Yuichi Ikuhara
Room-temperature dilute ferromagnetism has been reported for many semiconducting or insulating materials, which are usually in the forms of bulk or thin film. Here, we successfully fabricated dilute ferromagnetic nanowires by using dislocations—one-dimensional lattice defects—embedded between optica...
[Phys. Rev. B 96, 024440] Published Tue Jul 25, 2017



Weyl points and topological nodal superfluids in a face-centered-cubic optical lattice

2017-07-25T10:00:00-04:00

Author(s): Li-Jun Lang, Shao-Liang Zhang, K. T. Law, and Qi Zhou
We point out that a face-centered-cubic (fcc) optical lattice, which can be realized by a simple scheme using three lasers, provides one a highly controllable platform for creating Weyl points and topological nodal superfluids in ultracold atoms. In noninteracting systems, Weyl points automatically ...
[Phys. Rev. B 96, 035145] Published Tue Jul 25, 2017



Electron spin contrast of Purcell-enhanced nitrogen-vacancy ensembles in nanodiamonds

2017-07-25T10:00:00-04:00

Author(s): S. Bogdanov, M. Y. Shalaginov, A. Akimov, A. S. Lagutchev, P. Kapitanova, J. Liu, D. Woods, M. Ferrera, P. Belov, J. Irudayaraj, A. Boltasseva, and V. M. Shalaev
Nitrogen-vacancy centers in diamond allow for coherent spin-state manipulation at room temperature, which could bring dramatic advances to nanoscale sensing and quantum information technology. We introduce a method for the optical measurement of the spin contrast in dense nitrogen-vacancy (NV) ensem...
[Phys. Rev. B 96, 035146] Published Tue Jul 25, 2017



Compressing Green's function using intermediate representation between imaginary-time and real-frequency domains

2017-07-25T10:00:00-04:00

Author(s): Hiroshi Shinaoka, Junya Otsuki, Masayuki Ohzeki, and Kazuyoshi Yoshimi
Model-independent compact representations of imaginary-time data are presented in terms of the intermediate representation (IR) of analytical continuation. We demonstrate the efficiency of the IR through continuous-time quantum Monte Carlo calculations of an Anderson impurity model. We find that the...
[Phys. Rev. B 96, 035147] Published Tue Jul 25, 2017



Quantum lifetime in ultrahigh quality GaAs quantum wells: Relationship to Δ_{5/2} and impact of density fluctuations

2017-07-25T10:00:00-04:00

Author(s): Q. Qian, J. Nakamura, S. Fallahi, G. C. Gardner, J. D. Watson, S. Lüscher, J. A. Folk, G. A. Csáthy, and M. J. Manfra
We consider the quantum lifetime derived from low-field Shubnikov–de Haas oscillations as a metric of the quality of the two-dimensional electron gas in GaAs quantum wells that expresses large excitation gaps of the ν=5/2 fractional quantum Hall state in the N=1 Landau level. In high quality samples...
[Phys. Rev. B 96, 035309] Published Tue Jul 25, 2017



Double quantum dots defined in bilayer graphene

2017-07-25T10:00:00-04:00

Author(s): D. P. Żebrowski, F. M. Peeters, and B. Szafran
Artificial molecular states of double quantum dots defined in bilayer graphene are studied with the atomistic tight-binding method and its low-energy continuum approximation. We indicate that the extended electron wave functions have opposite parities on sublattices of the layers and that the ground...
[Phys. Rev. B 96, 035434] Published Tue Jul 25, 2017



Properties at the interface of graphene and Ti_{2}C MXene

2017-07-25T10:00:00-04:00

Author(s): Pallavi Paul, Poulami Chakraborty, Tilak Das, Dhani Nafday, and Tanusri Saha-Dasgupta
Employing ab initio calculations, we characterize the interfaces formed between graphene, a much discussed two-dimensional material, and MXene, another two-dimensional material of recent interest. Our study considering the specific case of Ti_{2}C, a member of the MXene family, shows the formation o...
[Phys. Rev. B 96, 035435] Published Tue Jul 25, 2017



Strong cavity-pseudospin coupling in monolayer transition metal dichalcogenides

2017-07-25T10:00:00-04:00

Author(s): Amrit De and Roger K. Lake
Strong coupling between the electronic states of monolayer transition metal dichalcogenides (TMDCs) such as MoS_{2},MoSe_{2},WS_{2}, or WSe_{2}, and a single in-plane optical cavity mode gives rise to valley- and spin-dependent cavity-QED effects. The Dirac Hamiltonian for this two-dimensional gappe...
[Phys. Rev. B 96, 035436] Published Tue Jul 25, 2017



Erratum: State-selective intersystem crossing in nitrogen-vacancy centers [Phys. Rev. B 91, 165201 (2015)]

2017-07-25T10:00:00-04:00

Author(s): M. L. Goldman, M. W. Doherty, A. Sipahigil, N. Y. Yao, S. D. Bennett, N. B. Manson, A. Kubanek, and M. D. Lukin
[Phys. Rev. B 96, 039905] Published Tue Jul 25, 2017



Topological photonics: From crystals to particles

2017-07-25T10:00:00-04:00

Author(s): Gleb Siroki, Paloma A. Huidobro, and Vincenzo Giannini
Photonic crystal topological insulators host protected states at their edges. In the band structure these edge states appear as continuous bands crossing the photonic band gap. They allow light to propagate unidirectionally and without scattering. In practice it is essential to make devices relying ...
[Phys. Rev. B 96, 041408(R)] Published Tue Jul 25, 2017



Cheshire charge in (3+1)-dimensional topological phases

2017-07-25T10:00:00-04:00

Author(s): Dominic V. Else and Chetan Nayak

The authors examine the phenomenon of “Cheshire charge” in topological phases of matter in three spatial dimensions. A looplike excitation is said to carry Cheshire charge if the charge is not locally detectable, that is, it can only be observed by a nonlocal process such as shrinking the loop to a point. The authors show that “Cheshire charge” is a generic feature of three-dimensional topological phases. They relate it to other features of these phases, such as three-loop braiding, as well as to higher-category theory that is hypothesized to be the general mathematical framework describing three-dimensional topological phases.

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[Phys. Rev. B 96, 045136] Published Tue Jul 25, 2017



Ab initio

2017-07-25T10:00:00-04:00

Author(s): Charles Paillard, Sergey Prosandeev, and L. Bellaiche
The change of shape under illumination by visible light, called photostriction, is investigated in the classical ferroelectrics barium titanate and lead titanate. By means of the ΔSCF method, the use of first-principle calculations confirms that the converse piezoelectric effect is the main driving ...
[Phys. Rev. B 96, 045205] Published Tue Jul 25, 2017



Theory and measurements of harmonic generation in semiconductor superlattices with applications in the 100 GHz to 1 THz range

2017-07-25T10:00:00-04:00

Author(s): M. F. Pereira, J. P. Zubelli, D. Winge, A. Wacker, A. S. Rodrigues, V. Anfertev, and V. Vaks
This manuscript describes harmonic generation in semiconductor superlattices, starting from a nonequilibrium Green's functions input to relaxation rate–type analytical approximations for the Boltzmann equation in which imperfections in the structure lead to asymmetric current flow and scattering pro...
[Phys. Rev. B 96, 045306] Published Tue Jul 25, 2017



Noninvasive control of excitons in two-dimensional materials

2017-07-25T10:00:00-04:00

Author(s): C. Steinke, D. Mourad, M. Rösner, M. Lorke, C. Gies, F. Jahnke, G. Czycholl, and T. O. Wehling
We investigate how external screening shapes excitons in two-dimensional semiconductors embedded in laterally structured dielectric environments. An atomic scale view of these elementary excitations is developed using models which apply to a variety of materials including transition metal dichalcoge...
[Phys. Rev. B 96, 045431] Published Tue Jul 25, 2017



Comment on “Electron-phonon coupling in two-dimensional silicene and germanene”

2017-07-25T10:00:00-04:00

Author(s): M. E. Cifuentes-Quintal, O. de la Peña-Seaman, and R. de Coss
In their work, Yan et al. [Phys. Rev. B 88, 121403 (2013)] employing density functional perturbation theory (DFPT) calculations, demonstrate that silicene and germanene show weaker Kohn anomalies in the Γ−E_{g} and K−A_{1} phonon modes, compared to graphene. Furthermore, the electron-phonon (e-ph) c...
[Phys. Rev. B 96, 047401] Published Tue Jul 25, 2017



Electrocaloric effects in the lead-free Ba(Zr,Ti)O_{3} relaxor ferroelectric from atomistic simulations

2017-07-24T10:00:00-04:00

Author(s): Zhijun Jiang, Sergei Prokhorenko, Sergey Prosandeev, Y. Nahas, D. Wang, Jorge Íñiguez, E. Defay, and L. Bellaiche
Atomistic effective Hamiltonian simulations are used to investigate electrocaloric (EC) effects in the lead-free Ba(Zr_{0.5}Ti_{0.5})O_{3} (BZT) relaxor ferroelectric. We find that the EC coefficient varies nonmonotonically with the field at any temperature, presenting a maximum that can be traced b...
[Phys. Rev. B 96, 014114] Published Mon Jul 24, 2017



Energy jump during bond breaking

2017-07-24T10:00:00-04:00

Author(s): Naoki Miyazawa, Masataka Hakamada, and Mamoru Mabuchi
In current fracture theory, the fracture stress is related to the surface energy on the basis of linear elastic theory. However, the fracture stress does not necessarily exceed the stress required to break atomic bonds. Here, we show that a jump in the inelastic separation energy is generated by fra...
[Phys. Rev. B 96, 014115] Published Mon Jul 24, 2017



Distribution function of random strains in an elastically anisotropic continuum and defect strengths of Tm^{3+} impurity ions in crystals with zircon structure

2017-07-24T10:00:00-04:00

Author(s): B. Z. Malkin, N. M. Abishev, E. I. Baibekov, D. S. Pytalev, K. N. Boldyrev, M. N. Popova, and M. Bettinelli
We construct a distribution function of the strain-tensor components induced by point defects in an elastically anisotropic continuum, which can be used to account quantitatively for many effects observed in different branches of condensed matter physics. Parameters of the derived six-dimensional ge...
[Phys. Rev. B 96, 014116] Published Mon Jul 24, 2017



Theory of avoided criticality in quantum motion in a random potential in high dimensions

2017-07-24T10:00:00-04:00

Author(s): Victor Gurarie
The density of states of a three-dimensional Dirac equation with a random potential as well as in other problems of quantum motion in a random potential placed in sufficiently high spatial dimensionality appears to be singular at a certain critical disorder strength. This was seen numerically in a v...
[Phys. Rev. B 96, 014205] Published Mon Jul 24, 2017



Low-field anomalous magnetic phase in the kagome-lattice shandite Co_{3}Sn_{2}S_{2}

2017-07-24T10:00:00-04:00

Author(s): Mohamed A. Kassem, Yoshikazu Tabata, Takeshi Waki, and Hiroyuki Nakamura
The magnetization process of single crystals of the metallic kagome ferromagnet Co_{3}Sn_{2}S_{2} was carefully measured via magnetization and ac susceptibility. Field-dependent anomalous transitions observed in low fields indicate the presence of an unconventional magnetic phase just below the Curi...
[Phys. Rev. B 96, 014429] Published Mon Jul 24, 2017



Induced spin-triplet pairing in the coexistence state of antiferromagnetism and singlet superconductivity: Collective modes and microscopic properties

2017-07-24T10:00:00-04:00

Author(s): D. E. Almeida, R. M. Fernandes, and E. Miranda
The close interplay between superconductivity and antiferromagnetism in several quantum materials can lead to the appearance of an unusual thermodynamic state in which both orders coexist microscopically, despite their competing nature. A hallmark of this coexistence state is the emergence of a spin...
[Phys. Rev. B 96, 014514] Published Mon Jul 24, 2017



Possible spin excitation structure in monolayer FeSe grown on SrTiO_{3}

2017-07-24T10:00:00-04:00

Author(s): Yi Gao, Yan Yu, Tao Zhou, Huaixiang Huang, and Qiang-Hua Wang
Based on recent high-resolution angle-resolved photoemission spectroscopy measurement in monolayer FeSe grown on SrTiO_{3}, we constructed a tight-binding model and proposed a superconducting (SC) pairing function which can well fit the observed band structure and SC gap anisotropy. Then we investig...
[Phys. Rev. B 96, 014515] Published Mon Jul 24, 2017



Quasi-two-dimensional behavior of 112-type iron-based superconductors

2017-07-24T10:00:00-04:00

Author(s): D. Sóñora, C. Carballeira, J. J. Ponte, Tao Xie, Huiqian Luo, Shiliang Li, and J. Mosqueira
Fluctuation magnetoconductivity and magnetization above the superconducting transition temperature (T_{c}) are measured on the recently discovered 112 family of iron-based superconductors (IBS), Ca_{1−x}La_{x}Fe_{1−y}Ni_{y}As_{2}, which presents an extra As-As chain spacer-layer. The analysis in ter...
[Phys. Rev. B 96, 014516] Published Mon Jul 24, 2017



s+is

2017-07-24T10:00:00-04:00

Author(s): Jakob Böker, Pavel A. Volkov, Konstantin B. Efetov, and Ilya Eremin
Motivated by the recent observations of small Fermi energies and comparatively large superconducting gaps, present also on bands not crossing the Fermi energy (incipient bands) in iron-based superconductors, we analyze the doping evolution of superconductivity in a four-band model across the Lifshit...
[Phys. Rev. B 96, 014517] Published Mon Jul 24, 2017



Evidence for enhanced phase fluctuations in nanostructured niobium thin films

2017-07-24T10:00:00-04:00

Author(s): Ting-Hui Chen, Hsiang-Hsi Kung, Chang-Ran Wang, Chia-Tso Hsieh, and Wei-Li Lee
In a superconducting nanostructure, phase fluctuations are prominent and give rise to finite resistance below superconducting transition temperature T_{c}. By using a monolayer polymer/nanosphere hybrid we developed previously, we fabricated a large array of interconnected niobium (Nb) honeycomb lat...
[Phys. Rev. B 96, 020506(R)] Published Mon Jul 24, 2017



Vibrational dynamics of a two-dimensional microgranular crystal

2017-07-24T10:00:00-04:00

Author(s): A. Vega-Flick, R. A. Duncan, S. P. Wallen, N. Boechler, C. Stelling, M. Retsch, J. J. Alvarado-Gil, K. A. Nelson, and A. A. Maznev
We study the dynamics of an ordered hexagonal monolayer of polystyrene microspheres adhered to a glass substrate coated with a thin aluminum layer. A laser-induced transient grating technique is employed to generate and detect three types of acoustic modes across the entire Brillouin zone in the Γ−K...
[Phys. Rev. B 96, 024303] Published Mon Jul 24, 2017