We investigate the surface stress of solid-liquid diffusive interfaces at equilibrium using the phase field crystal model in two dimensions. To analytically study the surface energy dependence on elastic strains, we employ the amplitude equation formalism and recast the free energy functional in ter...

[Phys. Rev. B 96, 214106] Published Fri Dec 15, 2017

]]>A fully quantum-mechanical description of the precessional damping of a Pt/Co bilayer is presented in the framework of the Keldysh Green's function approach using *ab initio* electronic structure calculations. In contrast to previous calculations of classical Gilbert damping (${\alpha}_{\mathrm{GD}}$), we demonstrate that...

[Phys. Rev. B 96, 214421] Published Fri Dec 15, 2017

]]>We fabricated electric-field-effect transistor structures with a channel layer of an itinerant ferromagnet ${\mathrm{SrRuO}}_{3}$ (SRO) heterostructured with a cap layer of ${\mathrm{BaTiO}}_{3}$ and investigated the electric field effects on the anomalous Hall effect (AHE) in SRO. We show that by applying positive and negative ga...

[Phys. Rev. B 96, 214422] Published Fri Dec 15, 2017

]]>An ubiquitous feature of cuprate superconductors is the existence of a normal-state pseudogap for underdoped compositions. Several experiments suggest that there may be a phase transition to the pseudogap state in which a symmetry is broken. One proposed scenario is that the pseudogap state breaks time-reversal symmetry due to the formation of circulating currents within each unit cell. The authors study underdoped YBa${}_{2}$Cu${}_{3}$O${}_{6+x}$ using polarized neutron scattering and show that this scenario is unlikely.

[Phys. Rev. B 96, 214504] Published Fri Dec 15, 2017

]]>Layered ${\mathrm{LnOBiS}}_{2}$ (where Ln represents a lanthanide element) compounds with Ln = La, Ce, Pr, Nd, and Yb can be rendered conducting and superconducting via two routes, substitution of F for O or the tetravalent ions Ti, Zr, Hf, and Th for trivalent Ln ions. Electrical resistivity measurements on nonflu...

[Phys. Rev. B 96, 214505] Published Fri Dec 15, 2017

]]>In this study, the superconducting gap symmetry of ${\mathrm{LaO}}_{0.5}{\mathrm{F}}_{0.5}\mathrm{BiSSe}$ is elucidated through specific heat measurements with one single crystal of ${\mathrm{LaO}}_{0.5}{\mathrm{F}}_{0.5}\mathrm{BiSSe}$. A clear jump is observed at 3.95 K in ${\mathrm{LaO}}_{0.5}{\mathrm{F}}_{0.5}\mathrm{BiSSe}$, suggesting bulk superconductivity. From specific heat measurements, $\mathrm{\Delta}{C}_{\mathrm{e}}/\gamma {T}_{\mathrm{c}}$ and $2\mathrm{\Delta}\left(0\right)...$

[Phys. Rev. B 96, 214506] Published Fri Dec 15, 2017

]]>We address the superconducting singlet state of anisotropic Dirac fermions that disperse linearly in one direction and parabolically in the other. For systems that have uniaxial anisotropy, we show that the electromagnetic response to an external magnetic flux is extremely anisotropic near the quant...

[Phys. Rev. B 96, 220503(R)] Published Fri Dec 15, 2017

]]>We present a two-dimensional lattice model for quantum spin-1/2 for which the low-energy limit is governed by four flavors of strongly interacting Majorana fermions. We study this low-energy effective theory using two alternative approaches. The first consists of a mean-field approximation. The seco...

[Phys. Rev. B 96, 224420] Published Fri Dec 15, 2017

]]>Time-resolved magneto-optical imaging reveals that the dynamics of the helicity-dependent all-optical switching (HD-AOS) of Co/Pt ferromagnetic multilayers occurs on the time scales from nanoseconds to seconds. We find HD-AOS proceeds by two stages. First, for an optimized laser fluence, the ultrash...

[Phys. Rev. B 96, 224421] Published Fri Dec 15, 2017

]]>We have studied the local structure of superconducting ${\mathrm{Ca}}_{10}{\mathrm{Pt}}_{4}{\mathrm{As}}_{8}{\left({\mathrm{Fe}}_{2}{\mathrm{As}}_{2}\right)}_{5}$ (Pt10418) and ${\mathrm{Ca}}_{10}{\mathrm{Ir}}_{4}{\mathrm{As}}_{8}{\left({\mathrm{Fe}}_{2}{\mathrm{As}}_{2}\right)}_{5}$ (Ir10418) iron arsenides, showing different transition temperatures $({T}_{c}=38$ and 16 K, respectively), by polarized Fe $K$-edge extended x-ray absorption fine-structure measurements. Despite the s...

[Phys. Rev. B 96, 224507] Published Fri Dec 15, 2017

]]>We investigate the magnetic breakdown (MB) phenomena by means of the recently proposed magnetic-field-containing relativistic tight-binding approximation (MFRTB) method [Phys. Rev. B **91**, 075122 (2015)]. In the MFRTB method, the MB phenomena can be described as the electron hopping between adjacent s...

[Phys. Rev. B 96, 235125] Published Fri Dec 15, 2017

]]>Semiconductor quantum dots are potential building blocks for scalable qubit architectures. Efficient control over the exchange interaction and the possibility of coherently manipulating electron states are essential ingredients towards this goal. We studied experimentally the shuttling of electrons ...

[Phys. Rev. B 96, 235305] Published Fri Dec 15, 2017

]]>We study electric transport along an integer quantum Hall edge where the proximity effect is induced due to a coupling to a superconductor. Such an edge exhibits two Majorana-Weyl fermions with different group velocities set by the induced superconducting pairing. We show that this structure of the ...

[Phys. Rev. B 96, 241104(R)] Published Fri Dec 15, 2017

]]>We report electron-hole conduction asymmetry in monolayer graphene. Previously, it has been claimed that electron-hole conduction asymmetry is due to imbalanced carrier injection from metallic electrodes. Here, we show that metallic contacts have negligible impact on asymmetric conduction and may be...

[Phys. Rev. B 96, 241407(R)] Published Fri Dec 15, 2017

]]>We experimentally investigate Andreev transport through the interface between an indium superconductor and the edge of the InAs/GaSb bilayer. To cover all possible regimes of the InAs/GaSb spectrum, we study samples with 10-nm-, 12-nm-, and 14-nm-thick InAs quantum wells. For the trivial case of a d...

[Phys. Rev. B 96, 245304] Published Fri Dec 15, 2017

]]>Spin-orbit (SO) splitting in the conduction-band minimum (CBM) of monolayer $\mathrm{W}{\mathrm{S}}_{2}$ plays a pivotal role in spintronics for spin-valley coupled electron. Using first-principles calculation, a large SO splitting at the *K* point in the CBM is achieved in halogen doped monolayer $\mathrm{W}{\mathrm{S}}_{2}$ (83.55 meV for F doped 4...

[Phys. Rev. B 96, 245305] Published Fri Dec 15, 2017

]]>It is known that the interplay between strong spin-orbit coupling and broken inversion symmetry can lead to chiral configurations in low-dimensional magnetic systems deposited on heavy-element surfaces. This phenomenon is due to the Dzyaloshinskii-Moriya interaction, which favours noncollinear magne...

[Phys. Rev. B 96, 245413] Published Fri Dec 15, 2017

]]>A method is presented for describing vibrational effects in x-ray absorption spectroscopy and resonant inelastic x-ray scattering (RIXS) using a combination of the classical Franck-Condon (FC) approximation and classical trajectories run on the core-excited state. The formulation of RIXS is an exten...

[Phys. Rev. B 96, 214302] Published Thu Dec 14, 2017

]]>Fe ${L}_{2,3}$-edge x-ray absorption spectra (XAS) and magnetic circular dichroism (MCD) in resonant inelastic x-ray scattering (RIXS) of $\alpha \text{\u2212}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ were measured to identify the electronic structure responsible for its weak ferromagnetism caused by the Dzyaloshinskii-Moriya interaction (DMI) at room temperat...

[Phys. Rev. B 96, 214420] Published Thu Dec 14, 2017

]]>Measurements of the Raman spectra in ${\mathrm{MgB}}_{2}$ up to 750 K are presented. The width of the ${E}_{2g}$ phonon line shows a pronounced maximum in the range of 350–400 K. In the same temperature range the frequency exhibits a sharp softening. The ${E}_{2g}$ phonon line is superimposed on the electronic background, whose ...

[Phys. Rev. B 96, 214503] Published Thu Dec 14, 2017

]]>Using a multiple scattering theory algorithm, we investigate numerically the transmission of ultrasonic waves through a disordered locally resonant metamaterial containing only monopolar resonators. By comparing the cases of a perfectly random medium with its pair correlated counterpart, we show tha...

[Phys. Rev. B 96, 220201(R)] Published Thu Dec 14, 2017

]]>A linear unsaturating magnetoresistance at high perpendicular magnetic fields, together with a quadratic positive magnetoresistance at low fields, has been seen in many different experimental materials, ranging from silver chalcogenides and thin films of InSb to topological materials like graphene a...

[Phys. Rev. B 96, 224203] Published Thu Dec 14, 2017

]]>Magnetic droplets are dynamical solitons that can be generated by locally suppressing the dynamical damping in magnetic films with perpendicular anisotropy. To date, droplets have been observed only in nanocontact spin-torque oscillators operated by spin-polarized electrical currents. Here, we exper...

[Phys. Rev. B 96, 224419] Published Thu Dec 14, 2017

]]>We present a study of the lower critical field, ${H}_{c1}$, of ${\mathrm{SrTi}}_{1-x}{\mathrm{Nb}}_{x}{\mathrm{O}}_{3}$ as a function of carrier concentration with the aim of quantifying the superfluid density. At low carrier concentration (i.e., the underdoped side), superfluid density and the carrier concentration in the normal state are equal wit...

[Phys. Rev. B 96, 224506] Published Thu Dec 14, 2017

]]>We devise a functional renormalization group treatment for a chain of interacting spinless fermions which is correct up to second order in interaction strength. We treat both inhomogeneous systems in real space as well as the translationally invariant case in a $k$-space formalism. The strengths and s...

[Phys. Rev. B 96, 235122] Published Thu Dec 14, 2017

]]>We use linked-cluster expansions to analyze the quantum phase transitions between symmetry-unbroken trivial and topological Haldane phases in two different spin-one chains. The first model is the spin-one Heisenberg chain in the presence of a single-ion anisotropy, while the second one is the dimeri...

[Phys. Rev. B 96, 235123] Published Thu Dec 14, 2017

]]>Detailed comparative theoretical and experimental study of electronic properties and spin structure was carried out for a series of Pb-based quaternary compounds ${\mathrm{PbBi}}_{2}{\mathrm{Te}}_{4-x}{\mathrm{Se}}_{x}$. For all values of $x$, these compounds are theoretically predicted to be topological insulators, possessing at high Se conten...

[Phys. Rev. B 96, 235124] Published Thu Dec 14, 2017

]]>We report on the hydrogenation of $(3\times 3)/(4\times 4)$ silicene epitaxially grown on Ag(111) studied by *in situ* Raman spectroscopy and state-of-the-art *ab initio* calculations. Our results demonstrate that hydrogenation of $(3\times 3)/(4\times 4)$ silicene leads to the formation of two different atomic structures which ex...

[Phys. Rev. B 96, 235423] Published Thu Dec 14, 2017

]]>A three-dimensional (3D) nodal-loop semimetal phase is exploited to engineer a number of intriguing phases featuring different peculiar topological surface states. In particular, by introducing various two-dimensional gap terms to a 3D tight-binding model of a nodal-loop semimetal, we obtain a rich ...

[Phys. Rev. B 96, 235424] Published Thu Dec 14, 2017

]]>Spin-orbit coupling is a single-particle phenomenon known to generate topological order, and electron-electron interactions cause ordered many-body phases to exist. The rich interplay of these two mechanisms is present in a broad range of materials and has been the subject of considerable ongoing re...

[Phys. Rev. B 96, 235425] Published Thu Dec 14, 2017

]]>We theoretically demonstrate that the in-plane magnetization-induced quantum anomalous Hall effect (QAHE) can be realized in the atomic crystal layers of group-V elements with a buckled honeycomb lattice. Based on $s{p}^{3}$ tight-binding models with parameters being extracted from first-principles results...

[Phys. Rev. B 96, 241103(R)] Published Thu Dec 14, 2017

]]>We study the realization of anyon-permuting symmetries of topological phases on the lattice using tensor networks. Working on the virtual level of a projected entangled pair state, we find matrix product operators (MPOs) that realize all unitary topological symmetries for the toric and color codes. ...

[Phys. Rev. B 96, 245122] Published Thu Dec 14, 2017

]]>Layered electrides, as typified by ${\mathrm{Ca}}_{2}\mathrm{N}$, are unconventional quasi-two-dimensional metals with low work functions, in which the conduction electrons are localized between the cation layers as well as *outside* the surface. We have investigated the electronic structure of the interface between a layered...

[Phys. Rev. B 96, 245303] Published Thu Dec 14, 2017

]]>We present a scanning tunneling microscopy/spectroscopy study of compressed Cl adlayers on Cu(111) under ultrahigh-vacuum conditions. We describe a rational scheme to assign Cl adatoms to different surface sites. The dominant electronic state visible in scanning tunneling spectroscopy (STS) correspo...

[Phys. Rev. B 96, 245411] Published Thu Dec 14, 2017

]]>We calculate the pure dephasing time of three-electron exchange-only qubits due to interaction with the nuclear hyperfine field. Within the $S={S}_{z}=1/2$ spin subspace, we derive formulas for the dephasing time as a function of the position within the stability diagram consisting of the $(1,1,1)$ charge re...

[Phys. Rev. B 96, 245412] Published Thu Dec 14, 2017

]]>The paraelectric-ferroelectric transition in $\mathrm{CdTi}{\mathrm{O}}_{3}$ has been monitored using high-resolution neutron diffraction data. This necessitated preparing a sample enriched in ${}^{114}\mathrm{Cd}$. A subtle, but significant, anisotropy in the thermal expansion of the lattice parameters for $\mathrm{CdTi}{\mathrm{O}}_{3}$ associated with the trans...

[Phys. Rev. B 96, 214105] Published Wed Dec 13, 2017

]]>Size effects on vibrational modes in complex crystals remain largely unexplored, despite their importance in a variety of electronic and energy conversion technologies. Enabled by advances in a four-probe thermal transport measurement method, we report the observation of glass-like thermal conductiv...

[Phys. Rev. B 96, 214202] Published Wed Dec 13, 2017

]]>Antiferromagnetic hexagonal MnTe is a promising material for spintronic devices relying on the control of antiferromagnetic domain orientations. Here we report on neutron diffraction, magnetotransport, and magnetometry experiments on semiconducting epitaxial MnTe thin films together with density fun...

[Phys. Rev. B 96, 214418] Published Wed Dec 13, 2017

]]>Quantum critical (QC) phenomena can be accessed by studying quantum magnets under an applied magnetic field ($B$). The QC points are located at the end points of magnetization plateaus and separate gapped and gapless phases. In one dimension, the low-energy excitations of the gapless phase form a Lutt...

[Phys. Rev. B 96, 214419] Published Wed Dec 13, 2017

]]>Applying thermodynamic integration within an *ab initio*-based free-energy approach is a state-of-the-art method to calculate melting points of materials. However, the high computational cost and the reliance on a good reference system for calculating the liquid free energy have so far hindered a gene...

[Phys. Rev. B 96, 224202] Published Wed Dec 13, 2017

]]>Antiferromagnetic domain distribution is analyzed by a scanning superconducting quantum interference device microscopy for a pyrochlore $\mathrm{T}{\mathrm{b}}_{2}\mathrm{I}{\mathrm{r}}_{2}{\mathrm{O}}_{7}$ thin film with an all-in–all-out (AIAO) spin arrangement. The local magnetic field on the surface is found to originate predominantly from the $\mathrm{T}{\mathrm{b}}^{3+}(J=6)$ ma...

[Phys. Rev. B 96, 224417] Published Wed Dec 13, 2017

]]>We report x-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements as well as multiplet calculations for Dy, Ho, Er, and Tm atoms adsorbed on Pt(111), Cu(111), Ag(100), and Ag(111). In the gas phase, all four elements are divalent and we label their $4f$ occupancy as $4{f}^{n}$. Upon ...

[Phys. Rev. B 96, 224418] Published Wed Dec 13, 2017

]]>The magnitude of the powder spin susceptibility of an optimally doped superconductor ${\mathrm{HgBa}}_{2}{\mathrm{CuO}}_{4+\delta}$ (Hg1201) in the normal state is found to be nearly the same as that of ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ near the optimally doped level. The Stoner enhancement factor of Hg1201 is larger than that of ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$. The magnit...

[Phys. Rev. B 96, 235118] Published Wed Dec 13, 2017

]]>Quantum orbital-selective Mott (OSM) transitions are investigated within dynamical mean-field theory based on a two-orbital Hubbard model with different bandwidth at half filling. We find two distinct OSM phases both showing coexistence of itinerant electrons and localized spins, dependent on whethe...

[Phys. Rev. B 96, 235119] Published Wed Dec 13, 2017

]]>Recent magnetoconductance measurements performed on magnetic topological insulator candidates have revealed butterfly-shaped hysteresis. This hysteresis has been attributed to the formation of gapless chiral domain-wall bound states during a magnetic-field sweep. We treat this phenomenon theoretical...

[Phys. Rev. B 96, 235120] Published Wed Dec 13, 2017

]]>Quantum oscillations, conventionally thought to be a metallic property, have recently been shown to arise in certain kinds of insulators, with properties very different from those in metals. All departures from the canonical behavior found so far appear in the amplitude and the phase but not in the ...

[Phys. Rev. B 96, 235121] Published Wed Dec 13, 2017

]]>We report on an electron-induced modification of alkali halides in the *ultrathin* film regime. The reaction kinetics and products of the modifications are investigated in the case of NaCl films grown on Ag(001). Their structural and chemical modification upon irradiation with electrons of energy 52–6...

[Phys. Rev. B 96, 235418] Published Wed Dec 13, 2017

]]>The control of a ferromagnet's magnetization via only electric currents requires the efficient generation of current-driven spin torques. In magnetic structures based on topological insulators (TIs) current-induced spin-orbit torques can be generated. Here we show that the addition of graphene, or b...

[Phys. Rev. B 96, 235419] Published Wed Dec 13, 2017

]]>Vertically (off-plane) ferroelectric ordering in ultrathin films has been pursued for decades. We predict the existence of intrinsic vertical polarization orderings in ultrathin metal chalcogen-diphosphates (MCDs). Taking ${\mathrm{CuInP}}_{2}{\mathrm{Se}}_{6}$ as an example, the first-principles calculation and electrostatic-en...

[Phys. Rev. B 96, 235420] Published Wed Dec 13, 2017

]]>Atomic nanolines are one-dimensional systems realized by assembling many atoms on a substrate into long arrays. The electronic properties of the nanolines depend on those of the substrate. Here, we demonstrate that to fully understand the electronic properties of Bi nanolines on clean Si(001) severa...

[Phys. Rev. B 96, 235421] Published Wed Dec 13, 2017

]]>Using an enhanced optically heterodyned optical Kerr effect method and a theoretical description of the interactions between an optical beam, a single layer of graphene, and its substrate, we provide experimental answers to questions raised by theoretical models of graphene third-order nonlinear opt...

[Phys. Rev. B 96, 235422] Published Wed Dec 13, 2017

]]>[Phys. Rev. B 96, 239903] Published Wed Dec 13, 2017

]]>We report low-temperature transport measurements in strained $\mathrm{InAs}/\mathrm{G}{\mathrm{a}}_{0.68}\phantom{\rule{0.16em}{0ex}}\mathrm{I}{\mathrm{n}}_{0.32}\mathrm{Sb}$ quantum wells, which supports time-reversal symmetry-protected helical edge states. The temperature and bias voltage dependence of the helical edge conductance for devices of various sizes are consistent with the theore...

[Phys. Rev. B 96, 241406(R)] Published Wed Dec 13, 2017

]]>After decades of progress and effort, obtaining a phase diagram for a strongly correlated topological system still remains a challenge. Although in principle one could turn to Wilson loops and long-range entanglement, evaluating these nonlocal observables at many points in phase space can be prohibi...

[Phys. Rev. B 96, 245119] Published Wed Dec 13, 2017

]]>The origin of low-energy excitations in the polycrystalline $\mathrm{E}{\mathrm{u}}_{0.42}\mathrm{S}{\mathrm{r}}_{0.58}\mathrm{Mn}{\mathrm{O}}_{3}$ manganite is explored by terahertz and infrared spectroscopies. The transition from the charge and/or orbital to antiferromagnetic order (${T}_{\mathrm{N}}=130-140\phantom{\rule{0.16em}{0ex}}\mathrm{K}$) is seen as smooth (spread over a temperature range from 50 to 100 K) dec...

[Phys. Rev. B 96, 245120] Published Wed Dec 13, 2017

]]>The complex interplay of elastic and inelastic scattering amenable to different levels of approximation constitutes the major challenge for the computation and hence interpretation of TEM-based spectroscopical methods. The two major approaches to calculate inelastic scattering cross sections of fast...

[Phys. Rev. B 96, 245121] Published Wed Dec 13, 2017

]]>We study the quantum quench problem for a class of bosonic conformal interfaces by computing the Loschmidt echo and the bipartite fidelity. The quench can be viewed as a sudden change of boundary conditions parametrized by $\theta $ when connecting two one-dimensional critical systems. They are classified b...

[Phys. Rev. B 96, 245409] Published Wed Dec 13, 2017

]]>Despite much anticipation of valleytronics as a candidate to replace the aging complementary metal-oxide-semiconductor (CMOS) based information processing, its progress is severely hindered by the lack of practical ways to manipulate valley polarization all electrically in an electrostatic setting. ...

[Phys. Rev. B 96, 245410] Published Wed Dec 13, 2017

]]>In Liu *et al.* [Phys. Rev. B **87**, 235306 (2013)], the authors obtain that the cross coupling between vector gauge field and chiral gauge field can lead to the anomaly of vector current. We demonstrate that this anomaly is not a physical effect. On one hand, it can be regulated out by the proper regula...

[Phys. Rev. B 96, 247301] Published Wed Dec 13, 2017

]]>Recently, in their Comment, Zhang *et al.* question our results of anomaly equations. In this Reply, we provide detailed derivation of anomaly equations from microscopic models and explain the reason why we respectfully disagree with the derivation and argument in the Comment.

[Phys. Rev. B 96, 247302] Published Wed Dec 13, 2017

]]>Although many works have been devoted to the order-disorder transition in carbon-supersaturated α-Fe, all seem to have overlooked the temperature hysteresis phenomenon occurring around the critical temperature. It is shown, from a mean-field model based on the elasticity theory of point defects, tha...

[Phys. Rev. B 96, 214104] Published Tue Dec 12, 2017

]]>We numerically construct translationally invariant quasiconserved operators with maximum range $M$, which best commute with a nonintegrable quantum spin chain Hamiltonian, up to $M=12$. In the large coupling limit, we find that the residual norm of the commutator of the quasiconserved operator decays ex...

[Phys. Rev. B 96, 214301] Published Tue Dec 12, 2017

]]>[Phys. Rev. B 96, 219901] Published Tue Dec 12, 2017

]]>Spin-memory loss (SML) of electrons traversing ferromagnetic-metal/heavy-metal (FM/HM), FM/normal-metal (FM/NM), and HM/NM interfaces is a fundamental phenomenon that *must* be invoked to explain consistently large numbers of spintronic experiments. However, its strength extracted by fitting experimen...

[Phys. Rev. B 96, 220403(R)] Published Tue Dec 12, 2017

]]>We study a frustrated spin-$\frac{1}{2}\phantom{\rule{0.16em}{0ex}}{J}_{1}\text{\u2212}{J}_{2}\text{\u2212}{J}_{3}\text{\u2212}{J}_{1}^{\perp}$ Heisenberg antiferromagnet on an $AA$-stacked bilayer honeycomb lattice. In each layer we consider nearest-neighbor (NN), next-nearest-neighbor, and next-next-nearest-neighbor antiferromagnetic (AFM) exchange couplings ${J}_{1},\phantom{\rule{0.16em}{0ex}}{J}_{2}$, and ${J}_{3}$, respectively. The two laye...

[Phys. Rev. B 96, 224416] Published Tue Dec 12, 2017

]]>The anomalous surface states of symmetry protected topological (SPT) phases are usually thought to be only possible in conjunction with the higher-dimensional topological bulk. However, it has recently been realized that a class of anomalous SPT surface states can be realized in the same dimension i...

[Phys. Rev. B 96, 235114] Published Tue Dec 12, 2017

]]>Analytical formulation of subcycle modulation (SCM) of dielectrics including electron excitation is presented. The SCM is sensitive to not only the time-resolved dynamical Franz-Keldysh effect (Tr-DFKE) [T. Otobe *et al.*, Phys. Rev. B **93**, 045124 (2016)], which is the nonlinear response without the e...

[Phys. Rev. B 96, 235115] Published Tue Dec 12, 2017

]]>Weyl semimetals possess low-energy excitations which act as monopoles of Berry curvature in momentum space. These emergent monopoles are at the heart of the many novel transport properties that Weyl semimetals exhibit. The singular nature of the Berry curvature around the nodal points in Weyl semime...

[Phys. Rev. B 96, 235116] Published Tue Dec 12, 2017

]]>We present results of ${}^{23}\mathrm{Na}$ and ${}^{19}\mathrm{F}$ nuclear magnetic resonance (NMR) measurements on ${\mathrm{NaCaCo}}_{2}{\mathrm{F}}_{7}$, a frustrated pyrochlore magnet with a Curie-Weiss temperature ${\mathrm{\Theta}}_{\mathrm{CW}}\approx -140$ K and intrinsic bond disorder. Below 3.6 K both the ${}^{23}\mathrm{Na}$ and ${}^{19}\mathrm{F}$ spectra broaden substantially in comparison to higher temperatures ac...

[Phys. Rev. B 96, 235117] Published Tue Dec 12, 2017

]]>We have investigated the optical properties of thin films of topological insulators ${\mathrm{Bi}}_{2}{\mathrm{Te}}_{3}$, ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$, and their alloys ${\mathrm{Bi}}_{2}{\left({\mathrm{Te}}_{1-x}{\mathrm{Se}}_{x}\right)}_{3}$ on ${\mathrm{BaF}}_{2}$ substrates by a combination of infrared ellipsometry and reflectivity in the energy range from 0.06 to 6.5 eV. For the onset of interband absorption in ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$, ...

[Phys. Rev. B 96, 235202] Published Tue Dec 12, 2017

]]>Low-dimensional electron systems often show a delicate interplay between electron-phonon and electron-electron interactions, giving rise to interesting quantum phases such as the charge density wave (CDW) and magnetism. Using the density-functional theory (DFT) calculations with the semilocal and hy...

[Phys. Rev. B 96, 235416] Published Tue Dec 12, 2017

]]>We theoretically study the quantum measurement of a double quantum dot coupled to environments by Bloch equations with an additional vector. Using a quantum point contact as a detector, we accurately calculate the current, the Fano factor, and the waiting time, respectively, to characterize the dyna...

[Phys. Rev. B 96, 235417] Published Tue Dec 12, 2017

]]>Chiral topological phases, like quantum Hall states, are characterized by anomalous unidirectional edge transport arising from a nontrivial insulating bulk. Recent developments suggest that they can be extended to periodically driven (Floquet) systems, where quantum information is pumped in lieu of charge or energy. The authors uncover a new chiral Floquet phase of quantum dynamics, whose edge pumps quantized units of fractionalized excitations. These phases are “radical,” in that the quantum dimension pumped is the square root of an integer. Unexpectedly, such edge borders a bulk with dynamical anyon transmutation, demonstrating a novel form of bulk-boundary correspondence.

[Phys. Rev. B 96, 245116] Published Tue Dec 12, 2017

]]>We revisit the numerical problem of computing the high temperature spin stiffness, or Drude weight, $D$ of the spin-$1/2$ $XXZ$ chain using exact diagonalization to systematically analyze its dependence on system symmetries and ensemble. Within the canonical ensemble and for states with zero total magneti...

[Phys. Rev. B 96, 245117] Published Tue Dec 12, 2017

]]>We present a reentrant phase transition in a bridging model between two different topological models: Kitaev and Haldane chains. This model is activated by introducing a bond alternation into the Kitaev chain [A. Y. Kitaev, Phys. Usp. **44**, 131 (2001)]. Without the bond alternation, the finite pairing...

[Phys. Rev. B 96, 245118] Published Tue Dec 12, 2017

]]>Random fields disorder Ising ferromagnets by aligning single spins in the direction of the random field in three space dimensions, or by flipping large ferromagnetic domains at dimensions two and below. While the former requires random fields of typical magnitude similar to the interaction strength,...

[Phys. Rev. B 96, 214414] Published Mon Dec 11, 2017

]]>We report an extensive study on the zero field ground state of a powder sample of the pyrochlore ${\mathrm{Yb}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$. A sharp heat capacity anomaly that labels a low temperature phase transition in this material is observed at 280 mK. Neutron diffraction shows that a *quasicollinear* ferromagnetic order develops...

[Phys. Rev. B 96, 214415] Published Mon Dec 11, 2017

]]>Using a two-band double-exchange model with Jahn-Teller lattice distortions and superexchange interactions, supplemented by quenched disorder, at an electron density $n=0.65$, we explicitly demonstrate the coexistence of the $n=1/2$-type $\left(\pi ,\pi \right)$ charge-ordered and the ferromagnetic nanoclusters above the ...

[Phys. Rev. B 96, 214416] Published Mon Dec 11, 2017

]]>We report on directly determining the complex permittivity tensor using a method combining a developed light source from a segmented cross undulator of synchrotron radiation and the magneto-optical Kerr effect. The empirical permittivity, which carries the electronic and magnetic information of a ma...

[Phys. Rev. B 96, 214417] Published Mon Dec 11, 2017

]]>The high-temperature normal state of the unconventional cuprate superconductors has resistivity linear in temperature $T$, which persists to values well beyond the Mott-Ioffe-Regel upper bound. At low temperatures, within the pseudogap phase, the resistivity is instead quadratic in $T$, as would be expe...

[Phys. Rev. B 96, 220502(R)] Published Mon Dec 11, 2017

]]>We use scattering theory to study the spatial resolution achievable in vibrational energy loss spectroscopy using a focused beam of high-energy ($\sim 100$ keV) electrons. We first outline a theory for calculating vibrational-spectroscopic images of crystalline or noncrystalline materials at nanometer spa...

[Phys. Rev. B 96, 224102] Published Mon Dec 11, 2017

]]>Extending the notion of symmetry protected topological phases to insulating antiferromagnets (AFs) described in terms of opposite magnetic dipole moments associated with the magnetic $\mathrm{N}\stackrel{\u0301}{\mathrm{e}}\mathrm{el}$ order, we establish a bosonic counterpart of topological insulators in semiconductors. Making use of the Aharon...

[Phys. Rev. B 96, 224414] Published Mon Dec 11, 2017

]]>Noncollinear antiferromagnets have recently been attracting considerable interest partly due to recent surprising discoveries of the anomalous Hall effect (AHE) in them and partly because they have promising applications in antiferromagnetic spintronics. Here we study the anomalous Nernst effect (AN...

[Phys. Rev. B 96, 224415] Published Mon Dec 11, 2017

]]>The magnetoelectric effects in the surface states of the three-dimensional (3D) topological insulator (TI) are extremely strong due to the full spin-momentum locking. Here the microscopic theory of S/3D TI bilayer structures in terms of quasiclassical Green's functions is developed. On the basis of ...

[Phys. Rev. B 96, 224505] Published Mon Dec 11, 2017

]]>The intrinsic magnetic state (ferromagnetic or antiferromagnetic) of ultrathin ${\mathrm{LaMnO}}_{3}$ films on the most commonly used ${\mathrm{SrTiO}}_{3}$ substrate is a long-existing question under debate. Either strain effect or nonstoichiometry was argued to be responsible for the experimental ferromagnetism. In a recent expe...

[Phys. Rev. B 96, 235112] Published Mon Dec 11, 2017

]]>Spin liquids are exotic quantum states characterized by the existence of fractional and deconfined quasiparticle excitations, referred to as spinons and visons. Their fractional nature establishes topological properties such as a protected ground-state degeneracy. This work investigates spin-orbit c...

[Phys. Rev. B 96, 235113] Published Mon Dec 11, 2017

]]>The interfacial phase-change memory (iPCM) ${\mathrm{GeTe}/\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$, a promising candidate for the next generation nonvolatile random-access memories, exhibits fascinating topological properties. Depending on the atomic-layer-stacking sequence of the GeTe block, the iPCM can be either in the SET (Ge-Te-Ge-Te) or...

[Phys. Rev. B 96, 235304] Published Mon Dec 11, 2017

]]>We consider a one-dimensional system combining local magnetic moments and a delocalized metallic band on top of a superconducting substrate. This system can describe a chain of magnetic impurities with both localized polarized orbitals and delocalized $s$-like orbitals or a conducting wire with embedd...

[Phys. Rev. B 96, 235411] Published Mon Dec 11, 2017

]]>We study the temperature dependence (77–475 K) of the longitudinal resistivity and Hall coefficient of thin films (thickness 20 nm) of three-dimensional topological Dirac semimetal ${\mathrm{Na}}_{3}\mathrm{Bi}$ grown via molecular beam epitaxy. The temperature-dependent Hall coefficient is electronlike at low temperature, ...

[Phys. Rev. B 96, 235412] Published Mon Dec 11, 2017

]]>Islands of Bi showing (110)- and (111)-orientated facets were grown on a Nb(110) single crystal and were studied with a scanning tunneling microscope at low temperatures. On the (111) facets, several states localized at step edges are identified from maps of the local differential conductance. We fi...

[Phys. Rev. B 96, 235413] Published Mon Dec 11, 2017

]]>Inelastic scattering of the medium-energy ($\sim 10\u2013100$ eV) electrons underlies the method of the high-resolution electron energy-loss spectroscopy (HREELS), which has been successfully used for decades to characterize pure and adsorbate-covered surfaces of solids. With the emergence of graphene and othe...

[Phys. Rev. B 96, 235414] Published Mon Dec 11, 2017

]]>Recently, two-dimensional (2D) multiferroics have attracted a lot of attention due to their fascinating properties and promising applications. Although the ferroelectric (FE)-ferroelastic and ferromagnetic (FM)-ferroelastic multiferroics have been observed/predicted in 2D systems, 2D ferromagnetic-f...

[Phys. Rev. B 96, 235415] Published Mon Dec 11, 2017

]]>We study the electronic structure of Tsai-type cluster-based quasicrystalline approximants, ${\mathrm{Au}}_{64}{\mathrm{Ge}}_{22}{\mathrm{Yb}}_{14}$ (AGY-I), ${\mathrm{Au}}_{63.5}{\mathrm{Ge}}_{20.5}{\mathrm{Yb}}_{16}$ (AGY-II), and ${\mathrm{Zn}}_{85.4}{\mathrm{Yb}}_{14.6}$ (Zn-Yb), by means of photoemission spectroscopy. In the valence band hard x-ray photoemission spectra of AGY-II and Zn-Yb, we separately obser...

[Phys. Rev. B 96, 241102(R)] Published Mon Dec 11, 2017

]]>Silicene, a two-dimensional (2D) honeycomb arrangement of Si atoms, is expected to have better electronic properties than graphene and has been mostly synthesized on Ag surfaces. Although scanning tunneling microscopy (STM) has been used for visualizing its atomic structure in real space, the interp...

[Phys. Rev. B 96, 241302(R)] Published Mon Dec 11, 2017

]]>To study exotic excitations described by parafermions in the possible spin liquid states of $\mathrm{SU}\left(n\right)$ spin systems, we introduce a parafermion parton approach. The $\mathrm{SU}\left(n\right)$ spin operators can be represented by clock and shift matrices, which are shown to be the polynomials of parafermion operators in the p...

[Phys. Rev. B 96, 245114] Published Mon Dec 11, 2017

]]>The Berry phase provides a modern formulation of electric polarization in crystals. Recently, this formulation was extended by the authors to higher electric multipole moments. In quantum mechanical crystalline insulators, such higher multipole moments manifest themselves by the presence of boundary-localized moments of lower dimension. In the presence of certain symmetries, these moments are quantized, and their boundary signatures are fractionalized. Here, the authors elaborate in detail on the theory of higher multipole moments and discuss associated topological pumping phenomena, as well as higher-order topological insulators derived from them.

[Phys. Rev. B 96, 245115] Published Mon Dec 11, 2017

]]>Arrays of dopants in silicon are promising platforms for the quantum simulation of the Fermi-Hubbard model. We show that the simplest model with only on-site interaction is insufficient to describe the physics of an array of phosphorous donors in silicon due to the strong intersite interaction in th...

[Phys. Rev. B 96, 245406] Published Mon Dec 11, 2017

]]>We use a time-dependent density functional theory approach to study the optical response of a hybrid nanostructure where the junction between thin metallic films is functionalized with a quantum well (QW) structure. We show that an unoccupied QW-localized electronic state opens the possibility of th...

[Phys. Rev. B 96, 245407] Published Mon Dec 11, 2017

]]>Scanning tunneling microscopy (STM) and spectroscopy (STS) in combination with density functional theory (DFT) calculations are employed to study the surface and subsurface properties of the metastable phase of the phase-change material ${\mathrm{Ge}}_{2}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{5}$ as grown by molecular beam epitaxy. The (111) surface...

[Phys. Rev. B 96, 245408] Published Mon Dec 11, 2017

]]>Hard-mode Raman spectroscopy was applied to analyze the temperature-induced transformation processes in perovskite-type $\left({\mathrm{ABO}}_{3}\right)$ single crystals of $\left(1\text{\u2212}x\right){\mathrm{Na}}_{0.5}{\mathrm{Bi}}_{0.5}{\mathrm{TiO}}_{3}\text{\u2212}x{\mathrm{BaTiO}}_{3}$ (NBT-$x\mathrm{BT})$ in a wide temperature range between 100 and 1010 K and a composition range of $x=0\u20130.074$ across the morphotropic phas...

[Phys. Rev. B 96, 214102] Published Fri Dec 08, 2017

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