Spontaneous breaking of a continuous symmetry described by a Mexican hat potential is relevant in many areas of physics, from magnetism to particle physics. Its effects manifest in the excitation spectrum as the emergence of Higgs and Goldstone modes, which are the amplitude and phase fluctuations of the order parameter. Here, the authors show, using density functional and Landau theories and Raman spectroscopy, that phonons at the crystallographic phase transition in the multiferroic hexagonal manganites provide a manifestation of Higgs and Goldstone excitations.

[Phys. Rev. B 102, 014102] Published Fri Jul 10, 2020

]]>We believe that a necessary first step in understanding the ground-state properties of the spin-${\scriptstyle \frac{1}{2}}$ kagome Heisenberg antiferromagnet is a better understanding of this model's very large number of low-energy singlet states. A description of the low-energy states that is both accurate and amenable for...

[Phys. Rev. B 102, 014413] Published Fri Jul 10, 2020

]]>We show how low-energy electronic models derived from the first-principles electronic structure calculations can help to rationalize the magnetic properties of two lacunar spinel compounds $\mathrm{Ga}{M}_{4}{\mathrm{S}}_{8}$ with relatively light ($M=\phantom{\rule{0.16em}{0ex}}\mathrm{V}$) and heavy ($M=\phantom{\rule{0.16em}{0ex}}\mathrm{Mo}$) transition-metal elements, which are responsible for differ...

[Phys. Rev. B 102, 014414] Published Fri Jul 10, 2020

]]>We study a system of $\overline{N}$ interacting triplons (the elementary excitations of a valence-bond solid) described by an effective interacting boson model derived within the bond operator formalism in order to determine the stability and the properties of many-triplon states. In particular, we consider the...

[Phys. Rev. B 102, 014415] Published Fri Jul 10, 2020

]]>Tensile strain is a promising tool for the creation and manipulation of magnetic solitonic textures in chiral helimagnets via tunable control of magnetic anisotropy and Dzyaloshinskii-Moriya interaction. Here, by using *in situ* resonant small-angle x-ray scattering, we demonstrate that skyrmion and c...

[Phys. Rev. B 102, 014416] Published Fri Jul 10, 2020

]]>The spin-$1/2$ ${J}_{1}$-${J}_{2}$ Heisenberg model on the square lattice represents one of the simplest examples in which the effects of magnetic interactions may suppress magnetic order, eventually leading to a pure quantum phase with no local order parameters. This model has been extensively studied in the last ...

[Phys. Rev. B 102, 014417] Published Fri Jul 10, 2020

]]>The atomic cluster expansion [R. Drautz, Phys. Rev. B **99**, 014104 (2019)] is extended in two ways, the modeling of vectorial and tensorial atomic properties and the inclusion of atomic degrees of freedom in addition to the positions of the atoms. In particular, atomic species, magnetic moments, and c...

[Phys. Rev. B 102, 024104] Published Fri Jul 10, 2020

]]>Opposite to the common idea of a magnetic order requirement to obtain spin current propagation, materials with no magnetic ordering have also been revealed to be efficient spin conductors. In this work, we investigate the spin current injection at the interface between a magnetic insulator and a sup...

[Phys. Rev. B 102, 024412] Published Fri Jul 10, 2020

]]>The magnonic spin Seebeck effect is a key element of spin caloritronics, a field that exploits thermal effects for spintronic applications. Early studies were focused on investigating the steady-state nonequilibrium magnonic spin Seebeck current, and the underlying physics of the magnonic spin Seebe...

[Phys. Rev. B 102, 024413] Published Fri Jul 10, 2020

]]>Spin density waves, based on modulated local moments, are usually associated with metallic materials, but have recently been reported in insulators which display coupled magnetic and structural order parameters. We discuss one such example, the multiferroic ${\mathrm{Cu}}_{3}{\mathrm{Nb}}_{2}{\mathrm{O}}_{8}$, which is reported to undergo two...

[Phys. Rev. B 102, 024414] Published Fri Jul 10, 2020

]]>It remains an open problem to prove the existence of a spectral gap in the 2D square-lattice Affleck-Kennedy-Lieb-Tasaki (AKLT) model. Here, the authors express the boundary state of the 2D AKLT model in terms of a classical loop model. By simulating the loop model and numerically analyzing the AKLT boundary state, the authors evidence a spectral gap in the square-lattice AKLT model. In addition, the authors vary the parameters of the loop model and study its three distinct phases.

[Phys. Rev. B 102, 035121] Published Fri Jul 10, 2020

]]>We present how to detect type-I Weyl nodes in a material by inelastic neutron scattering. Such an experiment first of all allows one to determine the dispersion of the Weyl fermions. We extend the reasoning to produce a quantitative test of the Weyl equation, taking into account realistic anisotropi...

[Phys. Rev. B 102, 035122] Published Fri Jul 10, 2020

]]>The homogeneous electron gas is one of the most studied model systems in condensed-matter physics. It is also the basis of the large majority of approximations to the functionals of density-functional theory. As such, its exchange-correlation energy has been studied extensively, and it is well-known...

[Phys. Rev. B 102, 035123] Published Fri Jul 10, 2020

]]>This paper presents a study on electron field emission (FE) into ultrahigh vacuum (UHV) from a single, cleaned, graphene sheet where its single sheet nature has been carefully characterized and the emission zones are unambiguously the sheet edges. This definitive approach is in contrast to almost al...

[Phys. Rev. B 102, 035416] Published Fri Jul 10, 2020

]]>We performed muon-spin-rotation/-relaxation measurements to investigate the magnetic behavior of ${T}^{\prime}$-type ${\mathrm{Eu}}_{2}{\mathrm{CuO}}_{4}$ (ECO), which is the parent compound of electron-doped cuprate superconductors, and the effects of oxygen-reduction annealing on its magnetism. In as-sintered (AS) ECO, we clarified the de...

[Phys. Rev. B 102, 045116] Published Fri Jul 10, 2020

]]>Quantized spin-wave known as magnon, a bosonic quasiparticle, can drag electrons or holes via *s-d* exchange interaction and boost the thermopower over the conventional diffusive thermopower. *P*-type magnon-drag thermopower has been observed in both ferromagnetic and antiferromagnetic metallic and dege...

[Phys. Rev. B 102, 045202] Published Fri Jul 10, 2020

]]>We consider a three-dimensional non-Hermitian exceptional line semimetal model and take open boundary conditions in the $x$, $y$, and $z$ directions separately. In each case, we calculate the parameter regions where the bulk-boundary correspondence is broken. The breakdown of the bulk-boundary corresponde...

[Phys. Rev. B 102, 045412] Published Fri Jul 10, 2020

]]>Photon-assisted tunneling frequently provides detailed information on the underlying charge-transfer process. In particular, the Tien-Gordon approach and its extensions predict that the sideband spacing in bias voltage is a direct fingerprint of the number of electrons transferred in a single tunnel...

[Phys. Rev. B 102, 045413] Published Fri Jul 10, 2020

]]>We report the results of the experimental investigation of magnonic Bloch modes in the presence of asymmetric dispersion induced by the interfacial Dzyaloshinskii-Moriya interaction by means of Brillouin light-scattering technique. It was realized in a specially designed ultrathin CoFeB/Pt periodic ...

[Phys. Rev. B 102, 014412] Published Thu Jul 09, 2020

]]>We consider the dynamics of maximal quantum Fisher information (MQFI) after sudden quenches for the one-dimensional transverse-field Ising model. Our results show, the same as Loschmidt echo, that there is a universality for the revival times, i.e., they do not depend on the initial state and the si...

[Phys. Rev. B 102, 024304] Published Thu Jul 09, 2020

]]>Electron dynamics in the bulk of large band gap dielectric crystals induced by intense femtosecond laser pulses at 800 nm is studied. With laser intensities (a few 10 $\mathrm{TW}/{\mathrm{cm}}^{2}$) under the ablation threshold, electrons with unexpected energies in excess of 40–50 eV are observed by using the photoemissio...

[Phys. Rev. B 102, 024305] Published Thu Jul 09, 2020

]]>The two-dimensional nature of graphene Josephson junctions offers the possibility of creating effective superconductor-ferromagnet-superconductor junctions with tunable Zeeman splitting caused by an in-plane magnetic field. Such junctions would be able to alternate between a conventional superconduc...

[Phys. Rev. B 102, 024510] Published Thu Jul 09, 2020

]]>We consider a dynamic protocol for quantum many-body systems, which enables us to study the interplay between unitary Hamiltonian driving and random local projective measurements. While the unitary dynamics tends to increase entanglement, local measurements tend to disentangle, thus favoring decoher...

[Phys. Rev. B 102, 035119] Published Thu Jul 09, 2020

]]>Because the iron-ladder compounds ${\mathrm{BaFe}}_{2}{X}_{3}$ ($X$ = S or Se) possess highly anisotropic crystal, electronic, and magnetic structures, the order in certain degrees of freedom leads to interesting interplays among them. Here we present a systematic study of the dielectric behavior of ${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$ and ${\mathrm{BaFe}}_{2}{\mathrm{Se}}_{3}$ a...

[Phys. Rev. B 102, 035120] Published Thu Jul 09, 2020

]]>The growth rate and crystal quality of $\beta \text{\u2212}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$ thin films are limited by suboxide (${\mathrm{Ga}}_{2}\mathrm{O}$) desorption. It has been reported that the growth of $\beta \text{\u2212}{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$ by molecular beam epitaxy and metalorganic chemical vapor deposition can be improved by an additional indium supply. In order to reveal the mechanism b...

[Phys. Rev. B 102, 035303] Published Thu Jul 09, 2020

]]>A major obstacle to reaching the wide applications of valleytronics operations is the lack of suitable anomalous valley Hall (AVH) materials, which should be easily fabricated and exhibit spontaneous valley polarization. Here, we identify an excellent two-dimensional AVH material, namely single-laye...

[Phys. Rev. B 102, 035412] Published Thu Jul 09, 2020

]]>We investigate tunneling dynamics of electrons from an ensemble of self-assembled InAs quantum dots into the subbands of a two-dimensional electron gas (2DEG). LO-phonon-assisted tunneling processes and tunneling into higher subbands of the 2DEG electronic structure cause distinct resonances in the ...

[Phys. Rev. B 102, 035413] Published Thu Jul 09, 2020

]]>We report three-pulse photodope-pump-probe measurements on photocarrier dynamics in semiconducting transition metal dichalcogenide monolayers of ${\mathrm{MoS}}_{2}$, ${\mathrm{WS}}_{2}$, ${\mathrm{MoSe}}_{2}$, and ${\mathrm{WSe}}_{2}$. The samples are fabricated by metal-organic chemical vapor deposition and mechanical exfoliation techniques and characterized b...

[Phys. Rev. B 102, 035414] Published Thu Jul 09, 2020

]]>We study the mechanical and electronic properties of heterobilayers composed of black phosphorus (BP) on hexagonal boron nitride (hBN) and of blue phosphorus (${\mathrm{P}}_{\mathrm{blue}}$) on hBN by means of *ab initio* density functional theory. Emphasis is put on how the stress applied on the constituent layers impact the...

[Phys. Rev. B 102, 035415] Published Thu Jul 09, 2020

]]>Using single-crystal neutron and x-ray diffraction, we discovered a charge density wave (CDW) below 320 K, which accounts for the long-sought origin of the heat capacity and resistivity anomalies in ${\mathrm{UPt}}_{2}{\mathrm{Si}}_{2}$. The modulation wave vector, ${\mathit{Q}}_{\mathrm{mod}}$, is intriguingly similar to the incommensurate wave vector ...

[Phys. Rev. B 102, 041112(R)] Published Thu Jul 09, 2020

]]>A ${30}^{\circ}$ twisted bilayer graphene demonstrates the quasicrystalline electronic states with 12-fold symmetry. These states are, however, far away from the Fermi level, which makes conventional Dirac fermion behavior dominating the low-energy spectrum in this system. By using a tight-binding approximatio...

[Phys. Rev. B 102, 045113] Published Thu Jul 09, 2020

]]>We present a general theory of quantum information propagation in chaotic quantum many-body systems. The generic expectation in such systems is that quantum information does not propagate in localized form; instead, it tends to spread out and scramble into a form that is inaccessible to local measur...

[Phys. Rev. B 102, 045114] Published Thu Jul 09, 2020

]]>We systematically generate the perturbative expansion for the two-particle spin susceptibility in the Feynman diagrammatic formalism and apply this expansion to a model system—the single-band Hubbard model on a square lattice. We make use of algorithmic Matsubara integration (AMI) [A. Taheridehkordi...

[Phys. Rev. B 102, 045115] Published Thu Jul 09, 2020

]]>The effect of a lateral electric current on the photoluminescence *H* band of an AlGaAs/GaAs heterostructure is investigated. The photoluminescence intensity and optical orientation of electrons contributing to the *H* band are studied by means of continuous-wave and time-resolved photoluminescence spec...

[Phys. Rev. B 102, 045302] Published Thu Jul 09, 2020

]]>In this paper, we investigate the transport properties of spinful electrons tunnel coupled to a finite-length Majorana nanowire on one end which is further tunnel coupled to a quantum dot (QD) at the other end. Using a full counting statistics approach, we show that Andreev reflection can happen in ...

[Phys. Rev. B 102, 045303] Published Thu Jul 09, 2020

]]>It is of fundamental importance but challenging to simultaneously identify atomic and magnetic configurations of two-dimensional van der Waals materials. In this work, we show that the nonreciprocal second-harmonic generation (SHG) can be a powerful tool to answer this challenge. Despite the preserv...

[Phys. Rev. B 102, 045411] Published Thu Jul 09, 2020

]]>Interfaces determine spin transfer efficiency of magnetic heterostructures. Here, the authors study spin pumping at the YIG/Pt interface, together with an atomic-scale investigation of interfacial magnetic states. This work singles out the structural, chemical, and magnetic states at the interface and clearly reveals their different roles in spin pumping, especially the critical role of the interfacial magnetic moments on spin mixing conductance at the interface, providing a guide to optimize future spintronics devices.

[Phys. Rev. B 102, 014411] Published Wed Jul 08, 2020

]]>Previous single-pulse extreme ultraviolet and x-ray coherent diffraction studies revealed that superfluid ${}^{4}\mathrm{He}$ droplets obtained in a free jet expansion acquire sizable angular momentum, resulting in significant centrifugal distortion. Similar experiments with normal fluid ${}^{3}\mathrm{He}$ droplets may help eluci...

[Phys. Rev. B 102, 014504] Published Wed Jul 08, 2020

]]>The discovery of superconductivity in a noncuprate NdNiO${}_{2}$ film on SrTiO${}_{3}$(001) has raised significant interest, though its origin is so far elusive. Since the bulk compound shows no superconductivity, here the authors focus on the role of the film geometry and surface and interface from first principles. A fundamentally distinct electronic reconstruction is found for the infinite layer, as opposed to perovskite films, involving the emergence of an interfacial two-dimensional electron gas and a concomitant depletion of the self-doping Nd 5$d$ states, rendering cupratelike behavior.

[Phys. Rev. B 102, 020502(R)] Published Wed Jul 08, 2020

]]>Recently resonant inelastic x-ray scattering experiments reported fine details of the charge excitations around the in-plane momentum ${\mathbf{q}}_{\parallel}=(0,0)$ for various doping rates in electron-doped cuprates ${\text{La}}_{2-x}{\text{Ce}}_{x}{\text{CuO}}_{4}$. We find that those new experimental data are well captured by acousticlike plasmon excitati...

[Phys. Rev. B 102, 024509] Published Wed Jul 08, 2020

]]>The Haldane-Shastry model is one of the most studied interacting spin systems. The Yangian symmetry makes it exactly solvable, and the model has semionic excitations. We introduce disorder into the Haldane-Shastry model by allowing the spins to sit at random positions on the unit circle and study th...

[Phys. Rev. B 102, 035117] Published Wed Jul 08, 2020

]]>Superconductivity has recently been observed in Sr-doped ${\mathrm{NdNiO}}_{2}$ films grown on ${\mathrm{SrTiO}}_{3}$. Whether it is caused by or related to the interface remains an open question. To address this issue, we use density-functional theory calculation and charge-transfer self-consistent model to study the effects of p...

[Phys. Rev. B 102, 035118] Published Wed Jul 08, 2020

]]>We investigate the band structure of twisted monolayer-bilayer graphene (tMBG) trilayers, or twisted graphene on bilayer graphene, as a function of twist angles and perpendicular electric fields in search of optimal conditions for achieving isolated nearly flat bands. Narrow bandwidths comparable to...

[Phys. Rev. B 102, 035411] Published Wed Jul 08, 2020

]]>Generally, stacking two quantum spin Hall insulators gives rise to a trivial insulator. Here, based on first-principles electronic structure calculations, we confirm that monolayer ${\mathrm{TaIrTe}}_{4}$ is a quantum spin Hall insulator and remarkably find that bilayer ${\mathrm{TaIrTe}}_{4}$ is still a quantum spin Hall insulato...

[Phys. Rev. B 102, 041109(R)] Published Wed Jul 08, 2020

]]>Bardasis-Schrieffer modes in superconductors are fluctuations in subdominant pairing channels, e.g., $d$-wave fluctuations in an $s$-wave superconductor. This Rapid Communication shows that these modes also generically occur in excitonic insulators. In $s$-wave excitonic insulators, a $p$-wave Bardasis-Schr...

[Phys. Rev. B 102, 041110(R)] Published Wed Jul 08, 2020

]]>Quantum dot devices allow one to access the critical point of the two-channel Kondo model. The effective critical theory involves a free Majorana fermion quasiparticle localized on the dot. As a consequence, this critical point shows both the phenomenon of non-Fermi-liquid physics and fractionalizat...

[Phys. Rev. B 102, 041111(R)] Published Wed Jul 08, 2020

]]>Correlated materials with open-shell $d$ and $f$ ions having degenerate band-edge states show a rich variety of interesting properties ranging from metal-insulator transition to unconventional superconductivity. The textbook view for the electronic structure of these materials is that mean-field approa...

[Phys. Rev. B 102, 045112] Published Wed Jul 08, 2020

]]>The propagation of Dirac fermions in graphene through a long-period periodic potential would result in a band folding together with the emergence of a series of cloned Dirac points (DPs) [C.-H. Park *et al.*, Nat. Phys. **4**, 213 (2008); C.-H. Park *et al.*Phys. Rev. Lett. **101**, 126804 (2008)]. In highly ...

[Phys. Rev. B 102, 045409] Published Wed Jul 08, 2020

]]>We present the theory and the application of a first-principle transport model employing a basis set obtained directly from the *ab initio* Bloch functions. We use a plane-wave density functional theory Hamiltonian and show that a judicious choice of the reduced basis set can effectively suppress the ...

[Phys. Rev. B 102, 045410] Published Wed Jul 08, 2020

]]>Hybrid improper ferroelectrics (HIFs) have been studied intensively over the past few years to gain an understanding of their temperature-induced phase transitions and ferroelectric switching pathways. Here we report a switching from a first- to a second-order phase transition pathway for HIFs ${\mathrm{Ca}}_{3-x}{\mathrm{...}}_{}$

[Phys. Rev. B 102, 014101] Published Tue Jul 07, 2020

]]>In this paper we report on adiabatic pumping in quasiperiodic stiffness-modulated beams. We show that distinct topological states populating nontrivial gaps can nucleate *avoided crossings* characterized by edge-to-edge transitions. Such states are inherently coupled when a smooth variation of the mod...

[Phys. Rev. B 102, 014305] Published Tue Jul 07, 2020

]]>We discuss spin-$\frac{1}{2}$ Heisenberg antiferromagnet on simple square lattice in magnetic field $H$ using a recently proposed bond-operator technique. It is well known that magnetically ordered phases of quantum magnets are well described at least qualitatively by the conventional spin-wave theory that only ...

[Phys. Rev. B 102, 014409] Published Tue Jul 07, 2020

]]>We have carried out neutron diffraction and small-angle neutron scattering measurements on a high-quality single crystal of the cubic lacunar spinel multiferroic, ${\mathrm{GaV}}_{4}{\mathrm{S}}_{8}$, as a function of magnetic field and temperature to determine the magnetic properties for the single electron that is located on t...

[Phys. Rev. B 102, 014410] Published Tue Jul 07, 2020

]]>Topological spin configurations in proximity to a superconductor have recently attracted great interest due to the potential application of the former in spintronics and also as another platform for realizing nontrivial topological superconductors. Their application in these areas requires precise k...

[Phys. Rev. B 102, 014503] Published Tue Jul 07, 2020

]]>A crystal structure that cannot be superposed on its mirror image by any combination of rotations and translations is classified as chiral. Such crystal structures have gained importance in recent years since they are prone to host unconventional magnetic orders and to exhibit topological magnetic t...

[Phys. Rev. B 102, 020404(R)] Published Tue Jul 07, 2020

]]>We systematically investigate the detailed dynamics of the phonon and local structure of rare-earth orthoferrites ${\mathrm{GdFeO}}_{3}$ single crystal with temperature and pressure induced structural/magnetic phase transition by Raman spectroscopy. Phonon evolution related to the motion of octahedra reveals parama...

[Phys. Rev. B 102, 024103] Published Tue Jul 07, 2020

]]>Combining inelastic neutron and x-ray scattering with atomic scale simulation, we report on a comprehensive study of the lattice dynamics and its relationship with the low thermal conductivity of the o-${\mathrm{Al}}_{13}{\mathrm{Co}}_{4}$ phase, a periodic approximant (about 100 atoms per cell) to a decagonal quasicrystal. The ...

[Phys. Rev. B 102, 024303] Published Tue Jul 07, 2020

]]>Single crystals of $\mathrm{Ca}{\left({\mathrm{Co}}_{1-x}{\mathrm{Ir}}_{x}\right)}_{2-y}{\mathrm{As}}_{2}$ with $0\le x\le 0.35$ and $0.10\le y\le 0.14$ have been grown using the self-flux technique and characterized by single-crystal x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy, magnetization $M$, and magnetic susceptibility $\chi $ measurements versus temperature $T$, magne...

[Phys. Rev. B 102, 024410] Published Tue Jul 07, 2020

]]>${\mathrm{Sc}}_{5}{\mathrm{Rh}}_{6}{\mathrm{Sn}}_{18}$ is a diamagnetic metallic compound (space group: $I{4}_{1}/acd,a\approx \phantom{\rule{0.28em}{0ex}}13.5\phantom{\rule{0.28em}{0ex}}\AA $, $c\approx \phantom{\rule{0.28em}{0ex}}27.1\phantom{\rule{0.28em}{0ex}}\AA $) which becomes superconducting (sc) at ${T}_{\mathrm{c}}=5.15\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. The sc state was studied on single-crystal samples by temperature- and field-dependent electrical resistivity, specific heat, and muon-spin rotation ($\mu \mathrm{SR}$) spectrosco...

[Phys. Rev. B 102, 024508] Published Tue Jul 07, 2020

]]>In recent years, the infinite time-evolving block decimation (iTEBD) method has been demonstrated to be one of the most efficient and powerful numerical schemes for time evolution in one-dimensional quantum many-body systems. However, a major shortcoming of the method, along with other state-of-the-...

[Phys. Rev. B 102, 035115] Published Tue Jul 07, 2020

]]>Through model Hamiltonian studies and first-principle electronic structure calculations, we have examined the effect of inversion symmetry breaking (ISB) field and hydrostatic pressure on the band topology of halide perovskites by taking ${\mathrm{MAPbI}}_{3}$ as a representative. Our study shows that while hydrost...

[Phys. Rev. B 102, 035116] Published Tue Jul 07, 2020

]]>Determination of defect ionization energy in low-dimensional semiconductors has been a long-standing unsolved problem in first-principles defect calculations, because the commonly used methods based on the jellium model introduce an unphysical charge density uniformly distributed in the material and...

[Phys. Rev. B 102, 035202] Published Tue Jul 07, 2020

]]>Using finite-difference time-domain simulations, we theoretically show that trapezoid *α*-phase molybdenum trioxide ($\alpha \text{\u2212}\mathrm{Mo}{\mathrm{O}}_{3}$) patch arrays can be used to achieve broadband perfect absorption due to its wide hyperbolic regions in infrared. In the merit of different reststrahlen (RS) bands for different ...

[Phys. Rev. B 102, 035408] Published Tue Jul 07, 2020

]]>The orbital Hall effect (OHE) is the phenomenon of transverse flow of orbital moment in the presence of an applied electric field. Solids with broken inversion symmetry are expected to exhibit a strong OHE due to the presence of an intrinsic orbital moment at individual momentum points in the Brillo...

[Phys. Rev. B 102, 035409] Published Tue Jul 07, 2020

]]>A Dirac fermion emerges as a result of interplay between symmetry and topology in condensed matter. Current research moves towards investigating the Dirac fermions in the presence of many-body effects in correlated systems. Here, we demonstrate the emergence of a correlation-induced symmetry-protect...

[Phys. Rev. B 102, 041108(R)] Published Tue Jul 07, 2020

]]>The diversity of various manganese types and its complexes in the Mn-doped ${\mathrm{A}}^{\mathrm{III}}{\mathrm{B}}^{\mathrm{V}}$ semiconductor structures leads to a number of intriguing phenomena. Here we show that the interplay between the ordinary substitutional Mn acceptors and interstitial Mn donors as well as donor-acceptor dimers could res...

[Phys. Rev. B 102, 041202(R)] Published Tue Jul 07, 2020

]]>Distinguishing between topological Majorana zero modes and quasi Majorana modes—trivial low-energy Andreev bound states—is an important step towards realizing topological hybrid nanowire devices. We propose that this distinction can be made by connecting a hybrid nanowire to a dissipative resonant l...

[Phys. Rev. B 102, 045111] Published Tue Jul 07, 2020

]]>Charge exchange and kinetic energy loss of slow highly charged xenon ions transmitted through freestanding monolayer ${\mathrm{MoS}}_{2}$ are studied. Two distinct exit charge state distributions, characterized by high and low charge states, are observed. They are accompanied by smaller and larger kinetic energy lo...

[Phys. Rev. B 102, 045408] Published Tue Jul 07, 2020

]]>Low-frequency quasilocalized modes of amorphous glass appear to exhibit universal density of states, depending on the frequencies as $D\left(\omega \right)\sim {\omega}^{4}$. To date, various models of glass formers with short-range binary interaction and network glass with both binary and ternary interactions were shown to conform...

[Phys. Rev. B 102, 014202] Published Mon Jul 06, 2020

]]>Recently, it was established that there exists a direct relation between the non-Hermitian skin effects, strong dependence of spectra on boundary conditions for non-Hermitian Hamiltonians, and boundary zero modes for Hermitian topological insulators. On the other hand, in terms of the spectral theor...

[Phys. Rev. B 102, 014203] Published Mon Jul 06, 2020

]]>By means of the discrete truncated Wigner approximation, we study dynamical phase transitions arising in the steady state of transverse-field Ising models after a quantum quench. Starting from a fully polarized ferromagnetic initial condition, these transitions separate a phase with nonvanishing mag...

[Phys. Rev. B 102, 014303] Published Mon Jul 06, 2020

]]>Recent research has shown that a proper spatiotemporal modulation of material properties (i.e., mass density or stiffness) can break reciprocity for elastic waves; however, such concepts are challenging to implement experimentally in mechanical waveguides. Piezoelectric metamaterials offer the possi...

[Phys. Rev. B 102, 014304] Published Mon Jul 06, 2020

]]>We report on our evaluation of field-induced magnetic moments in the paramagnetic state of the $\text{spin-}\frac{1}{2}$ antiferromagnetic trimerized (${J}_{1}-{J}_{2}-{J}_{2}$) chain compound ${\mathrm{Cu}}_{3}{\left({\mathrm{P}}_{2}{\mathrm{O}}_{6}\mathrm{OD}\right)}_{2}$ with ${J}_{1}=111\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ and ${J}_{2}=30\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ [M. Hase *et al.*, Phys. Rev. B **76**, 064431 (2007)]. Magnetic reflections with integer indices, generated b...

[Phys. Rev. B 102, 014403] Published Mon Jul 06, 2020

]]>While the electrical current manipulation of antiferromagnets (AFMs) has been demonstrated, the extent of the studied AFM materials has been limited with few systematic experiments and a poor understanding. We compare the electrical current switching of the exchange-bias field (${H}_{\text{ex}}$) in AFM-${\mathrm{Mn}}_{3}A\mathrm{N}$/fer...

[Phys. Rev. B 102, 014404] Published Mon Jul 06, 2020

]]>Spin-transfer-driven oscillations of a transverse domain wall confined to a perpendicular spin-valve structure are investigated using a one-dimensional model. The stack consists of a polarizer, nonmagnetic spacer, soft free layer, and pinned magnetic layer. It is found that the domain-wall oscillati...

[Phys. Rev. B 102, 014405] Published Mon Jul 06, 2020

]]>We report measurements on ${\mathrm{Ti}}_{4}{\mathrm{MnBi}}_{2}$, where a crystal structure involving linear chains of Mn ions suggests one-dimensional magnetic character. The electrical resistivity is metallic, consistent with the results of electronic-structure calculations that find a robust Fermi surface albeit with moderate...

[Phys. Rev. B 102, 014406] Published Mon Jul 06, 2020

]]>In a certain kind of ferrimagnets, the net spin angular momentum in the magnet vanishes at a certain temperature, called the angular momentum compensation temperature (${T}_{A}$). The angular momentum compensation is key for high-speed magnetic devices because the magnetization can be swiftly switched due to no inertia of the spin angular momentum accompanied by the magnetic moment. Here, the authors have discovered that the NMR signal is enhanced at ${T}_{A}$ due to the enhancement of the domain wall mobility. This discovery paves the way to exploring new materials possessing the angular momentum compensation.

[Phys. Rev. B 102, 014407] Published Mon Jul 06, 2020

]]>We have investigated the magnetic correlations in the candidate Weyl semimetals ${\mathrm{EuCd}}_{2}P{n}_{2}$ ($Pn=\mathrm{As}$, Sb) by resonant elastic x-ray scattering at the ${\mathrm{Eu}}^{2+}$ ${M}_{5}$ edge. The temperature and field dependence of the diffuse scattering of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ provide direct evidence that the Eu moments exhibit slow ferromagn...

[Phys. Rev. B 102, 014408] Published Mon Jul 06, 2020

]]>We study the coupling of the fully symmetric vibration mode of arsenic atoms to magnetism in a $\mathrm{Ba}{\left({\mathrm{Fe}}_{1-x}{\mathrm{Au}}_{x}\right)}_{2}{\mathrm{As}}_{2}$ system by polarization-resolved Raman spectroscopy and neutron diffraction. In this system, there are two phase transitions: a tetragonal-to-orthorhombic structural phase transition at tem...

[Phys. Rev. B 102, 014501] Published Mon Jul 06, 2020

]]>We present a novel method for embedding spin and charge fluctuations in an anisotropic, multiband, and full-bandwidth Eliashberg treatment of superconductivity. Our analytical framework, based on the random phase approximation, allows for a self-consistent calculation of material-specific characteri...

[Phys. Rev. B 102, 014502] Published Mon Jul 06, 2020

]]>We present analytic results for a special dimer model on the *nonbipartite* and *nonplanar* checkerboard lattice that does not allow for parallel dimers surrounding diagonal links. We *exactly* calculate the number of closed packed dimer coverings on finite checkerboard lattices under periodic boundary co...

[Phys. Rev. B 102, 020401(R)] Published Mon Jul 06, 2020

]]>Layered magnets have recently received tremendous attention, however spin-exchange coupling mechanism across their interlayer regions is yet to be revealed. Here, we report a Bethe-Slater-curve (BSC)-like behavior in *nine* transition metal dichalcogenide bilayers ($M{X}_{2}$, $M=\mathrm{V}$, Cr, Mn; $X=\mathrm{S}$, Se, Te) and e...

[Phys. Rev. B 102, 020402(R)] Published Mon Jul 06, 2020

]]>The I-Mn-V antiferromagnet, NaMnBi, develops a very large positive magnetoresistance (MR) up to 10 000% at 2 K and 9 T in crystals showing a semiconductor-to-metal transition (SMT). In the absence of an SMT, a modest (20%) MR is achieved. Here, we show that upon cooling below the magnetic transition...

[Phys. Rev. B 102, 020403(R)] Published Mon Jul 06, 2020

]]>There has been much recent interest in exotic superconductivity involving a Fermi surface of Bogoliubov quasiparticles, the so-called Bogoliubov Fermi surface (BG-FS). Here, the authors prove that a centrosymmetric BG-FS becomes unstable under a pairing formation of Bogoliubov quasiparticles. They also prove that the Fermi surface survives even under this instability, in stark contrast to the Bardeen-Cooper-Schrieffer mechanism of superconductivity. This work opens up new possibilities for competing orders in new topological materials, such as FeSe and Sr${}_{2}$RuO${}_{4}$, which may help in the search for exotic superconductivity.

[Phys. Rev. B 102, 020501(R)] Published Mon Jul 06, 2020

]]>The recovery of metastable structures formed at high pressure has been a long-standing goal in the field of condensed matter physics. While laser-driven compression has been used as a method to generate novel structures at high pressure, to date no high-pressure phases have been quenched to ambient ...

[Phys. Rev. B 102, 024101] Published Mon Jul 06, 2020

]]>Simple elastic models of spin-crossover compounds are known empirically to exhibit classical critical behavior. We demonstrate how the long-range interactions responsible for this behavior arise naturally upon integrating out mechanical fluctuations of such a model. A mean-field theory applied to th...

[Phys. Rev. B 102, 024102] Published Mon Jul 06, 2020

]]>We report that current-induced spin-orbit torques (SOTs) in heavy-metal/ferromagnetic-metal bilayers are strongly altered by the oxidation of the ferromagnetic layer near the interface. We measured damping-like (DL) and field-like (FL) SOTs for Pt/Co and $\mathrm{Pt}/{\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ (Pt/Py) films using spin-torque f...

[Phys. Rev. B 102, 024405] Published Mon Jul 06, 2020

]]>We study the critical behavior of a generalized icosahedral model on the simple cubic lattice. The field variable of the icosahedral model might take 1 of 12 vectors of unit length which are given by the normalized vertices of the icosahedron as value. Similar to the Blume-Capel model, where in addi...

[Phys. Rev. B 102, 024406] Published Mon Jul 06, 2020

]]>Several recent studies have shown that SCAN, a functional belonging to the meta-generalized gradient approximation (MGGA) family, leads to significantly overestimated magnetic moments in itinerant ferromagnetic metals. However, this behavior is not inherent to the MGGA level of approximation since T...

[Phys. Rev. B 102, 024407] Published Mon Jul 06, 2020

]]>Compounds with two-dimensional (2D) layers of magnetic ions weakly connected by van der Waals bonding offer routes to enhance quantum behavior, stimulating both fundamental and applied interest. ${\mathrm{CrPS}}_{4}$ is one such magnetic van der Waals material, however, it has undergone only limited investigation. ...

[Phys. Rev. B 102, 024408] Published Mon Jul 06, 2020

]]>We report on the magnon spectrum of Kitaev-Heisenberg magnets and extract the parameters to model a two-dimensional ${\text{CrI}}_{3}$. Our minimal spin Hamiltonian includes a contribution stemming from a Heisenberg, isotropic exchange, and a contribution arising from a Kitaev interaction, anisotropic and frustra...

[Phys. Rev. B 102, 024409] Published Mon Jul 06, 2020

]]>It was recently pointed out that Fermi surfaces can survive even in superconductors. Here, the authors study the instability of such systems toward electronic ordering. The ordered states are classified into diagonal and off-diagonal ones, which, respectively, indicate the Pomeranchuk instability and Cooper pairing not of original electrons but of Bogoliubov particles (bogolons). The corresponding order parameters are expanded by multipole moments and multiplet pair amplitudes of original electrons. These results provide insights into superconductors with multiple phase transitions.

[Phys. Rev. B 102, 024505] Published Mon Jul 06, 2020

]]>The self-energy of a moving vortex is shown to decrease with increasing velocity. The interaction energy of two parallel slowly moving vortices differs from the static case by a small term $\propto {v}^{2}$; the “slow” motion is defined as having the velocity $v<{v}_{c}={c}^{2}/4\pi \sigma \lambda $, where $\sigma \left(T\right)$ is the conductivity of nor...

[Phys. Rev. B 102, 024506] Published Mon Jul 06, 2020

]]>Although Heusler compounds were discovered more than 100 years ago, research in this family of materials continues to reveal remarkable phenomena. Here, the authors describe a solid-state synthesis method for making LiPd${}_{2}M$ ($M$=Si, Ge, Sn) and report superconductivity in LiPd${}_{2}$Ge with ${T}_{c}$=1.96 K. LiPd${}_{2}$Ge appears to be the first example of type-I superconductivity among Heusler compounds. Theoretical calculations reveal the presence of soft modes that enhance the electron-phonon coupling and can be responsible for the observed superconductivity.

[Phys. Rev. B 102, 024507] Published Mon Jul 06, 2020

]]>Nanomolecular assemblies of ${\mathrm{C}}_{60}$ can be synthesized to enclose dipolar molecules. The low-temperature states of such endofullerenes are described by quantum mechanical rotors, which are candidates for quantum information devices with higher-dimensional local Hilbert spaces. The experimental explorati...

[Phys. Rev. B 102, 035108] Published Mon Jul 06, 2020

]]>Deviations of low-energy electronic structurse of iron-based superconductors from density-functional-theory predictions have been parametrized in terms of band- and orbital-dependent mass renormalizations and energy shifts. The former have typically been described in terms of a local self-energy wit...

[Phys. Rev. B 102, 035109] Published Mon Jul 06, 2020

]]>The electronic properties in a solid depend on the specific form of the wave functions that represent the electronic states in the Brillouin zone. Since the discovery of topological insulators, much attention has been paid to the restrictions that the symmetry imposes on the electronic band structur...

[Phys. Rev. B 102, 035110] Published Mon Jul 06, 2020

]]>We report angle-resolved photoemission spectroscopy and first-principles numerical calculations for the band-structure evolution of the $3d$ heavy-fermion compound $\mathrm{CaC}{\mathrm{u}}_{3}\mathrm{R}{\mathrm{u}}_{4}{\mathrm{O}}_{12}$. Below $T\phantom{\rule{0.28em}{0ex}}\sim \phantom{\rule{0.28em}{0ex}}200$ K, we observed an emergent hybridization gap between the Cu 3*d-*electron-like band and the Ru 4*d-*hole-like band an...

[Phys. Rev. B 102, 035111] Published Mon Jul 06, 2020

]]>We apply a stochastic version of an optimally tuned range-separated hybrid functional to provide insight on the electronic properties of P- and B-doped Si nanocrystals of experimentally relevant sizes. We show that we can use the range-separation parameter for undoped systems to calculate accurate r...

[Phys. Rev. B 102, 035112] Published Mon Jul 06, 2020

]]>The origin of orbital order in correlated transition-metal compounds is strongly debated. For the paradigmatic ${e}_{g}$ systems ${\mathrm{KCuF}}_{3}$ and ${\mathrm{LaMnO}}_{3}$, it has been shown that the electronic Kugel'-Khomskii mechanism alone is not sufficient to drive the orbital-ordering transition up to the high temperatures at ...

[Phys. Rev. B 102, 035113] Published Mon Jul 06, 2020

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