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Published: 2017-11-17T23:03:00+00:00
2017-11-17T10:00:00+00:00
Author(s): P. Marton, A. Klíč, M. Paściak, and J. HlinkaThe work describes a first-principles-based computational strategy for studying structural phase transitions, and in particular, for determination of the so-called Landau-Devonshire potential—the classical zero-temperature limit of the Gibbs energy, expanded in terms of order parameters. It exploits...
2017-11-17T10:00:00+00:00
Author(s): Malvika Tripathi, R. J. Choudhary, D. M. Phase, T. Chatterji, and H. E. FischerThe classical belief about the mechanism of spin reorientation phase transition (SRPT) and ground-state magnetic structure in ${\mathrm{SmCrO}}_{3}$ has become intriguing because of inconsistent bulk magnetization observations. The presence of highly neutron-absorbing Sm atom has so far evaded the d...
2017-11-17T10:00:00+00:00
Author(s): Jiansen Zheng, Scott Bender, Jogundas Armaitis, Roberto E. Troncoso, and Rembert A. DuineWe develop a Green's function formalism for spin transport through heterostructures that contain metallic leads and insulating ferromagnets. While this formalism in principle allows for the inclusion of various magnonic interactions, we focus on Gilbert damping. As an application, we consider ballis...
2017-11-17T10:00:00+00:00
Author(s): M. G. Gonzalez, E. A. Ghioldi, C. J. Gazza, L. O. Manuel, and A. E. TrumperWe investigate the effect of dimensional crossover in the ground state of the antiferromagnetic spin-1 Heisenberg model on the anisotropic triangular lattice that interpolates between the regime of weakly coupled Haldane chains $({J}^{′}≪J)$ and the isotropic triangular lattice $({J}^{′}=J)$. We use...
2017-11-17T10:00:00+00:00
Author(s): Andrey V. Chubukov and Steven A. KivelsonWe consider Kohn-Luttinger mechanism for superconductivity in a two-dimensional electron gas confined to a narrow well between two grounded metallic planes with two occupied subbands with Fermi momenta ${k}_{FL}>{k}_{FS}$. On the basis of a perturbative analysis, we conclude that non-$s$-wave sup...
2017-11-17T10:00:00+00:00
Author(s): M. Micoulaut, A. Piarristeguy, H. Flores-Ruiz, and A. PradelThe effect of van der Waals dispersion correction in combination with density functional theory is investigated on a canonical amorphous phase-change material. Density functional theory (DFT), using the generalized gradient approximation, usually fails to reproduce the structure of amorphous telluri...
2017-11-17T10:00:00+00:00
Author(s): V. Ilakovac, S. Carniato, P. Foury-Leylekian, S. Tomić, J.-P. Pouget, P. Lazić, Y. Joly, K. Miyagawa, K. Kanoda, and A. NicolaouResonant inelastic x-ray scattering at the N $K$ edge reveals clearly resolved harmonics of the anion plane vibrations in the $κ$-(BEDT-${\mathrm{TTF})}_{2}{\mathrm{Cu}}_{2}$(${\mathrm{CN})}_{3}$ spin-liquid insulator. Tuning the incoming light energy at the $K$ edge of two distinct N sites permits ...
2017-11-17T10:00:00+00:00
Author(s): I. Charaev, T. Silbernagel, B. Bachowsky, A. Kuzmin, S. Doerner, K. Ilin, A. Semenov, D. Roditchev, D. Yu. Vodolazov, and M. SiegelWe show that narrow superconducting strips in superconducting (S) and normal (N) states are universally described by the model presenting them as lateral NSN proximity systems in which the superconducting central band is sandwiched between damaged edge bands with suppressed superconductivity. The wi...
2017-11-17T10:00:00+00:00
Author(s): Robert E. Throckmorton, Chengxian Zhang, Xu-Chen Yang, Xin Wang, Edwin Barnes, and S. Das SarmaWe present a set of experimentally feasible pulse sequences that implement any single-qubit gate on a singlet-triplet spin qubit and demonstrate that these new sequences are up to three times faster than existing sequences in the literature. We show that these sequences can be extended to incorporat...
2017-11-17T10:00:00+00:00
Author(s): Samuel Foster, Mischa Thesberg, and Neophytos NeophytouNanocomposites are promising candidates for the next generation of thermoelectric materials since they exhibit extremely low thermal conductivities as a result of phonon scattering on the boundaries of the various material phases. The nanoinclusions, however, should not degrade the thermoelectric po...
2017-11-17T10:00:00+00:00
Author(s): A. Sindona, M. Pisarra, C. Vacacela Gomez, P. Riccardi, G. Falcone, and S. BellucciOne of the amazing properties of graphene is the ultrarelativistic behavior of its loosely bound electrons, mimicking massless fermions that move with a constant velocity, inversely proportional to a fine-structure constant ${α}_{g}$ of the order of unity. The effective interaction between these qua...
2017-11-17T10:00:00+00:00
Author(s): J. C. Palmstrom, A. T. Hristov, S. A. Kivelson, J.-H. Chu, and I. R. FisherWe report the observation of a nonlinear elastoresistivity response for the prototypical underdoped iron pnictide $\mathrm{Ba}{({\mathrm{Fe}}_{0.975}{\mathrm{Co}}_{0.025})}_{2}{\mathrm{As}}_{2}$. Our measurements reveal a large quadratic term in the isotropic (${A}_{1g}$) electronic response that wa...
2017-11-17T10:00:00+00:00
Author(s): Stephen E. Weitzner and Ismaila DaboThe detailed atomistic modeling of electrochemically deposited metal monolayers is challenging due to the complex structure of the metal-solution interface and the critical effects of surface electrification during electrode polarization. Accurate models of interfacial electrochemical equilibria are...
2017-11-17T10:00:00+00:00
Author(s): D. C. Cabra, G. L. Rossini, A. Ferraz, G. I. Japaridze, and H. JohannessonWe propose a spin filter device based on the interplay of a modulated spin-orbit interaction and a uniform external magnetic field acting on a quantum wire. Half-metal phases, where electrons with only a selected spin polarization exhibit ballistic conductance, can be tuned by varying the magnetic f...
2017-11-17T10:00:00+00:00
Author(s): Rui Chen, Dong-Hui Xu, and Bin ZhouMotivated by the very recent experimental realization of electronic Lieb lattices and research interest on topological states of matter, we study the topological phase transitions driven by Anderson-type disorder on spin-orbit coupled Lieb lattices in the presence of spin-independent and -dependent ...
2017-11-16T10:00:00+00:00
Author(s): Dil K. Limbu, Raymond Atta-Fynn, David A. Drabold, Stephen R. Elliott, and Parthapratim BiswasWe present a force-biased Monte Carlo (FMC) method for structural modeling of the transition-metal clusters of Fe, Ni, and Cu with sizes of 13, 30, and 55 atoms. By employing the Finnis-Sinclair potential for Fe and the Sutton-Chen potential for Ni and Cu, the total energy of the clusters is minimiz...
2017-11-16T10:00:00+00:00
Author(s): M. Opačić, N. Lazarević, D. Tanasković, M. M. Radonjić, A. Milosavljević, Yongchang Ma, C. Petrovic, and Z. V. PopovićRaman scattering spectra of zigzag spin chain ${\mathrm{TaFe}}_{1.25}{\mathrm{Te}}_{3}$ single crystal are presented in a temperature range from 80 to 300 K. Nine Raman active modes of ${A}_{g}$ and ${B}_{g}$ symmetry are clearly observed and assigned by probing different scattering channels, which ...
2017-11-16T10:00:00+00:00
Author(s): Mohammad F. MaghrebiDriven-dissipative systems define a broad class of nonequilibrium systems where an external drive (e.g., laser) competes with a dissipative environment. The steady state of dynamics is generically distinct from a thermal state characteristic of equilibrium. As a representative example, a driven-diss...
2017-11-16T10:00:00+00:00
Author(s): O. Gladii, D. Halley, Y. Henry, and M. BailleulThe techniques of propagating spin-wave spectroscopy and current-induced spin-wave Doppler shift are applied to a 20-nm-thick Fe/MgO(001) film. The magnetic parameters extracted from the position of the spin-wave resonance peaks are very close to those tabulated for bulk iron. From the zero-current ...
2017-11-16T10:00:00+00:00
Author(s): Zhiqiang Wang, John Berlinsky, Gertrud Zwicknagl, and Catherine KallinThe polar Kerr effect, or equivalently the ac anomalous Hall effect, is a signature of time-reversal symmetry breaking in chiral superconductors. Seeing it requires additional ingredients, such as disorder or multiple bands. The simplest model of chiral superconductivity in UPt${}_{3}$, which is thought to be $f$ wave, would not exhibit a Kerr effect. Here, it is shown that the “starfish” Fermi surface, where the bands stick together at the top and bottom of the Brillouin zone, can exhibit a Kerr effect due to multiband effects and to mixing of $f$- and $d$-wave order parameters that are respectively even and odd in the hcp sublattice index.
(image)2017-11-16T10:00:00+00:00
Author(s): M. Naritsuka, T. Ishii, S. Miyake, Y. Tokiwa, R. Toda, M. Shimozawa, T. Terashima, T. Shibauchi, Y. Matsuda, and Y. KasaharaIn the quest for exotic superconducting pairing states, the Rashba effect, which lifts the electron-spin degeneracy as a consequence of strong spin-orbit interaction (SOI) under broken inversion symmetry, has attracted considerable interest. Here, to introduce the Rashba effect into two-dimensional ...
2017-11-16T10:00:00+00:00
Author(s): S. Xing, J. Mansart, V. Brouet, M. Sicot, Y. Fagot-Revurat, B. Kierren, P. Le Fèvre, F. Bertran, J. E. Rault, U. B. Paramanik, Z. Hossain, A. Chainani, and D. MalterreThe electronic structure of the reentrant superconductor $\mathrm{Eu}({\mathrm{Fe}}_{0.86}{\mathrm{Ir}}_{0.14}$)${}_{2}{\mathrm{As}}_{2}$ (${T}_{c}=22$ K) with coexisting ferromagnetic order (${T}_{M}=18$ K) is investigated using angle-resolved photoemission spectroscopy and scanning tunneling spect...
2017-11-16T10:00:00+00:00
Author(s): T. N. G. Meier, M. Kronseder, and C. H. Back2017-11-16T10:00:00+00:00
Author(s): Xiaojun Cheng, Xujun Ma, Miztli Yépez, Azriel Z. Genack, and Pier A. MelloThe single-parameter scaling hypothesis relating the average and variance of the logarithm of the conductance is a pillar of the theory of electronic transport. We use a maximum-entropy ansatz to explore the logarithm of the particle, or energy density $ln\mathcal{W}(x)$ at a depth $x$ into a random...
2017-11-16T10:00:00+00:00
Author(s): Ding Hu, Wenliang Zhang, Yuan Wei, Bertrand Roessli, Markos Skoulatos, Louis Pierre Regnault, Genfu Chen, Yu Song, Huiqian Luo, Shiliang Li, and Pengcheng DaiWe use neutron polarization analysis to study spin excitation anisotropy in the optimally isovalent-doped superconductor ${\mathrm{BaFe}}_{2}$(${\mathrm{As}}_{0.7}{\mathrm{P}}_{0.3}$)${}_{2}$ (${T}_{c}=30$ K). Different from optimally hole- and electron-doped ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, ...
2017-11-16T10:00:00+00:00
Author(s): Yuk Tai Chan, P. L. Alireza, K. Y. Yip, Q. Niu, K. T. Lai, and Swee K. GohThe layered transition metal dichalcogenide ${\mathrm{WTe}}_{2}$ has recently attracted significant attention due to the discovery of an extremely large magnetoresistance, a predicted type-II Weyl semimetallic state, and a pressure-induced superconducting state. By a careful measurement of the super...
2017-11-16T10:00:00+00:00
Author(s): Li Yue, Xiao Ren, Tingting Han, Jianqing Guo, Zhicheng Wu, Yan Zhang, and Yuan LiWe use inelastic light scattering to study ${\mathrm{Sr}}_{1−x}{\mathrm{Na}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ ($x≈0.34$), which exhibits a robust tetragonal magnetic phase that restores the fourfold rotation symmetry inside the orthorhombic magnetic phase. With cooling, we observe splitting an...
2017-11-16T10:00:00+00:00
Author(s): Antonio Caretta, Martina Dell'Angela, Yi-De Chuang, Alexandra M. Kalashnikova, Roman V. Pisarev, Davide Bossini, Florian Hieke, Wilfried Wurth, Barbara Casarin, Roberta Ciprian, Fulvio Parmigiani, Surge Wexler, L. Andrew Wray, and Marco MalvestutoWe report a high-resolution resonant inelastic extreme ultraviolet (EUV) scattering study of the quantum Heisenberg antiferromagnet ${\mathrm{KCoF}}_{3}$. By tuning the EUV photon energy to the cobalt ${M}_{23}$ edge, a complete set of low-energy $3d$ spin-orbital excitations is revealed. These low-...
2017-11-16T10:00:00+00:00
Author(s): Leon Droenner and Alexander CarmeleWe investigate the Heisenberg $XXZ$ chain with long-range interactions in the $Z$ dimension. By applying two magnetic boundary reservoirs, we drive the system out of equilibrium and induce a nonzero steady-state current. The long-range coupled chain shows nearly ballistic transport and linear respon...
2017-11-16T10:00:00+00:00
Author(s): Alex Gurevich and Takayuki KuboWe calculate a low-frequency surface impedance of a dirty, $s$-wave superconductor with an imperfect surface incorporating either a thin layer with a reduced pairing constant or a thin, proximity-coupled normal layer. Such structures model realistic surfaces of superconducting materials which can co...
2017-11-16T10:00:00+00:00
Author(s): Nicholas Sedlmayr, Vardan Kaladzhyan, Clément Dutreix, and Cristina BenaThe bulk-boundary correspondence establishes a connection between the bulk topological index of an insulator or superconductor, and the number of topologically protected edge bands or states. For topological superconductors in two dimensions, the first Chern number is related to the number of protec...
2017-11-16T10:00:00+00:00
Author(s): T. Knispel, W. Jolie, N. Borgwardt, J. Lux, Zhiwei Wang, Yoichi Ando, A. Rosch, T. Michely, and M. GrüningerThe peculiar surface transport properties of topological insulators often require tuning of the Fermi level close to the Dirac point. This, however, reduces the screening capabilities of the Dirac-like surface carriers and thus enhances the sensitivity to Coulomb disorder present in compensated materials. Coulomb disorder drives the formation of puddles, local accumulations of charge carriers both in the bulk and on the surface. In the topological insulator BiSbTeSe${}_{2}$, the coexistence of surface puddles and bulk puddles is revealed by scanning tunneling spectroscopy and optical spectroscopy. Quantitative analysis shows that bulk puddles contribute to the screening of surface potential fluctuations in this undoped compound. Understanding and controlling the puddles will be a key to realizing novel phenomena in 3D topological materials.
(image)2017-11-16T10:00:00+00:00
Author(s): R. C. Vilão, R. B. L. Vieira, H. V. Alberto, J. M. Gil, and A. WeidingerIn muon-spin-rotation experiments, positive muons are implanted in the material and come to rest in the unrelaxed host lattice. The formation of the final configuration requires a lattice relaxation which does not occur instantly. The present paper is concerned with the transition from the initial s...
2017-11-16T10:00:00+00:00
Author(s): M. Luengo-Kovac, S. Huang, D. Del Gaudio, J. Occena, R. S. Goldman, R. Raimondi, and V. SihThe current-induced spin polarization and momentum-dependent spin-orbit field were measured in ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1−x}\mathrm{As}$ epilayers with varying indium concentrations and silicon doping densities. Samples with higher indium concentrations and carrier concentrations and lower m...
2017-11-16T10:00:00+00:00
Author(s): C. Dutreix and P. DelplaceThis work addresses the problem of elastic scattering on a localized impurity in a one-dimensional crystal with sublattice degrees of freedom. The impurity yields long-range interferences in the local density of states known as Friedel oscillations. Here we show that the internal degrees of freedom ...
2017-11-16T10:00:00+00:00
Author(s): Ajit K. Vallabhaneni, Dhruv Singh, Hua Bao, Jayathi Murthy, and Xiulin Ruan2017-11-16T10:00:00+00:00
Author(s): Wenjie Xi (奚文杰) and Wei Ku (顧威)In commonly employed models for two-dimensional (2D) topological insulators, bulk gapless states are well known to form at the band inversion points where the degeneracy of the states is protected by symmetries. It is thus sometimes quite tempting to consider this feature, the occurrence of gapless ...
2017-11-16T10:00:00+00:00
Author(s): Stephan Rachel, Eric Mascot, Sagen Cocklin, Matthias Vojta, and Dirk K. MorrLattices of magnetic adatoms deposited on the surface of $s$-wave superconductors (Shiba lattices) have been proposed as a new platform for topological superconductivity, allowing for the local manipulation and detection of Majorana modes via scanning-probe techniques. The authors demonstrate that the topological Majorana edge modes of nanoscopic Shiba islands display universal electronic and transport properties. Most remarkably, these Majorana modes possess a quantized charge conductance that is proportional to the topological Chern number ($C$), and carry a supercurrent whose chirality reflects the sign of $C$. These results establish nanoscopic Shiba islands as promising components in future topology-based devices.
(image)2017-11-16T10:00:00+00:00
Author(s): M. Charlebois, S. Verret, A. Foley, O. Simard, D. Sénéchal, and A.-M. S. TremblayThe presence of incommensurate spiral spin-density waves (SDW) has been proposed to explain the $p$ (hole doping) to $1+p$ jump measured in the Hall number ${n}_{H}$ at a doping ${p}^{*}$. Here we explore incommensurate collinear SDW as another possible explanation of this phenomenon, distinct from ...
2017-11-16T10:00:00+00:00
Author(s): Bruno Mettout and Pierre TolédanoA polarized light beam modifies the equilibrium tensors associated with any measurable property of a crystal. The light-induced linear magnetoelectric susceptibility and electric current density of bismuth ferrite (BFO) are investigated theoretically using their expansion in Wigner spherical functio...
2017-11-15T10:00:00+00:00
Author(s): A. Huynh, E. Péronne, C. Gingreau, X. Lafosse, A. Lemaître, B. Perrin, R. Vacher, B. Rufflé, and M. ForetWe report picosecond acoustic measurements of longitudinal sound dispersion and attenuation in an amorphous ${\mathrm{SiO}}_{2}$ layer at temperatures from 20 to 300 K over frequencies ranging from about 40 to 200 GHz. The sample is a radio frequency cathodic sputtered silica layer grown on a sapphi...
2017-11-15T10:00:00+00:00
Author(s): Tong Liu, Hai-Yang Yan, and Hao GuoWe investigate the interplay between disorder and superconducting pairing for a one-dimensional $p$-wave superconductor subject to slowly varying incommensurate potentials with mobility edges. With amplitude increments of the incommensurate potentials, the system can undergo a transition from a topo...
2017-11-15T10:00:00+00:00
Author(s): Patrick Müller, Andre Lohmann, Johannes Richter, Oleg Menchyshyn, and Oleg DerzhkoWe use the rotation-invariant Green's function method (RGM) and the high-temperature expansion (HTE) to study the thermodynamic properties of the spin-$S$ Heisenberg ferromagnet on the pyrochlore lattice. We examine the excitation spectra as well as various thermodynamic quantities, such as the orde...
2017-11-15T10:00:00+00:00
Author(s): P. L. Stroganov and Ya. V. FominovWe consider ballistic SQUIDs with spin filtering inside half-metallic ferromagnetic arms. A singlet Cooper pair cannot pass through an arm in this case, so the Josephson current is entirely due to the Cooper pair splitting, with two electrons going to different interferometer arms. In order to eluci...
2017-11-15T10:00:00+00:00
Author(s): Dushko Kuzmanovski and Annica M. Black-SchafferWe consider a buckled quantum spin Hall insulator (QSHI), such as silicene, proximity coupled to a conventional spin-singlet $s$-wave superconductor. Even limiting the discussion to the disorder-robust $s$-wave pairing symmetry, we find both odd-frequency ($ω$) spin-singlet and spin-triplet pair amp...
2017-11-15T10:00:00+00:00
Author(s): Jing Li, Jian Peng, Shuai Zhang, and Genfu ChenSingle crystals of ${\mathrm{HfTe}}_{3}$ were successfully grown using a chemical transport reaction in an extremely narrow temperature range. Here, we report a comparative study of polycrystalline and single-crystal samples. The electrical resistivity $ρ(T)$ measured on polycrystalline samples show...
2017-11-15T10:00:00+00:00
Author(s): Guillaume Dupont, Fabien Remy, Olivier Kimmoun, Bernard Molin, Sebastien Guenneau, and Stefan EnochThe present study investigates a way to design dikes which can filter the wavelengths of ocean surface waves. This offers the possibility to achieve a structure that can attenuate waves associated with storm swell, without affecting coastline in other conditions. Our approach is based on low-frequen...
2017-11-15T10:00:00+00:00
Author(s): C. D. Ling, M. C. Allison, S. Schmid, M. Avdeev, J. S. Gardner, C.-W. Wang, D. H. Ryan, M. Zbiri, and T. SöhnelWe have experimentally identified a different magnetic ground state for the kagome lattice, in the perfectly hexagonal ${\mathrm{Fe}}^{2+}$ ($3{d}^{6},\phantom{\rule{0.16em}{0ex}}S=2$) compound ${\mathrm{Fe}}_{4}{\mathrm{Si}}_{2}{\mathrm{Sn}}_{7}{\mathrm{O}}_{16}$. A representational symmetry analys...
2017-11-15T10:00:00+00:00
Author(s): Florian Pforr, Kai-Christian Meyer, Márton Major, Karsten Albe, Wolfgang Donner, Uwe Stuhr, and Alexandre IvanovThe local dynamics of the lead-free relaxor $0.964{\mathrm{Na}}_{1/2}{\mathrm{Bi}}_{1/2}{\mathrm{TiO}}_{3}−0.036{\mathrm{BaTiO}}_{3}$ (NBT-3.6BT) have been investigated by a combination of quasielastic neutron-scattering (QENS) and ab initio molecular dynamics simulations. In a previous paper, we we...
2017-11-15T10:00:00+00:00
Author(s): Taiki HagaThe critical behavior of a random-field $\mathbf{O}(N)$ model driven at a uniform velocity is investigated near three dimensions at zero temperature. From intuitive arguments, we predict that the large-scale behavior of the $D$-dimensional driven random-field $\mathbf{O}(N)$ model is identical to th...
2017-11-15T10:00:00+00:00
Author(s): R. Coehoorn, P. A. Bobbert, and H. van EerselTriplet-polaron quenching (TPQ) is a major cause of the efficiency loss at large current densities in phosphorescent organic light-emitting diodes. The nature of the interaction process is presently not well understood. In this paper, we study TPQ due to Förster-type triplet-polaron interactions in ...
2017-11-15T10:00:00+00:00
Author(s): A. V. Korovin, Y. Pennec, and B. Djafari-RouhaniThe interaction of phononic cavities modes in one-dimensional nanobeam-based structures is investigated theoretically. The overlapping of two closely spaced phononic cavity modes leads to the formation of symmetric and antisymmetric modes, which can be used for the modulation of the frequency and th...
2017-11-15T10:00:00+00:00
Author(s): A. L. Wysocki, V. N. Valmispild, A. Kutepov, S. Sharma, J. K. Dewhurst, E. K. U. Gross, A. I. Lichtenstein, and V. P. AntropovSpatial and time scales of spin-density fluctuations (SDFs) were analyzed in $3d$ ferromagnets using ab initio linear-response calculations of complete wave-vector and energy dependence of the dynamic spin susceptibility tensor. We demonstrate that SDFs are spread continuously over the entire Brillo...
2017-11-15T10:00:00+00:00
Author(s): Daisuke Akahoshi, Shuto Koshikawa, Takuro Nagase, Eiji Wada, Kosuke Nishina, Ryo Kajihara, Hideki Kuwahara, and Toshiaki SaitoWe have investigated the magnetic properties of ${\mathrm{EuTi}}_{1−x}{\mathrm{Al}}_{x}{\mathrm{O}}_{3}$ with $0≤x≤1$ and established a detailed magnetic phase diagram. Substitution of ${\mathrm{Ti}}^{4+}$ with ${\mathrm{Al}}^{3+}$, which oxidizes magnetic ${\mathrm{Eu}}^{2+}$ $(J=7/2)$ into nonmagn...
2017-11-15T10:00:00+00:00
Author(s): D. E. Jackson, D. VanGennep, Y. K. Vohra, S. T. Weir, and J. J. HamlinUsing a membrane-driven diamond anvil cell and both ac magnetic susceptibility and electrical resistivity measurements, we have characterized the superconducting phase diagram of elemental barium to pressures as high as 65 GPa. We have determined the superconducting properties of the recently discov...
2017-11-15T10:00:00+00:00
Author(s): A. Ribak, I. Silber, C. Baines, K. Chashka, Z. Salman, Y. Dagan, and A. Kanigel$1T\text{−}{\mathrm{TaS}}_{2}$ is a layered transition-metal dichalcogenide with a very rich phase diagram. At $T=180$ K it undergoes a metal to Mott insulator transition. Mott insulators usually display antiferromagnetic ordering in the insulating phase but $1T\text{−}{\mathrm{TaS}}_{2}$ was never ...
2017-11-15T10:00:00+00:00
Author(s): Hafssaa Latioui and Mário G. SilveirinhaFor long wavelengths, three-dimensional connected metallic wire meshes are impenetrable by light and have an electromagnetic response similar to that of an electron gas below the plasma frequency. Surprisingly, here it is shown that when two opaque metallic meshes are spatially interlaced, the combi...
2017-11-15T10:00:00+00:00
Author(s): Abhijeet Alase, Emilio Cobanera, Gerardo Ortiz, and Lorenza ViolaCan one steer a material by its surface? A generalization of Bloch’s theorem to arbitrary boundary conditions reveals actionable links going from surface physics towards changing overall electronic properties. Furthermore, it predicts the existence, in short-range systems, of topological zero-energy modes with power-law corrections, and answers basic questions about system sizes, for which bulk and surface properties merge. The theorem yields exact inversion-free diagonalization algorithms, potentially of interest for large-scale band-structure calculations, by leveraging two new constructs: the analytic continuation of the Bloch Hamiltonian off the Brillouin zone and the boundary matrix that efficiently encodes the interplay between bulk and boundary conditions.
(image)2017-11-15T10:00:00+00:00
Author(s): Xizhou Qin (秦锡洲), Feng Mei (梅锋), Yongguan Ke (柯勇贯), Li Zhang (张莉), and Chaohong Lee (李朝红)Strongly interacting topological states in multiparticle quantum systems pose great challenges to both theory and experiment. Recently, bound states of elementary spin waves (magnons) in quantum magnets have been experimentally observed in quantum Heisenberg chains comprising ultracold Bose atoms in...
2017-11-15T10:00:00+00:00
Author(s): Thore Posske, Björn Trauzettel, and Michael ThorwartIn one spatial dimension, anyons in the original description of Leinaas and Myrheim are formally equivalent to locally interacting bosons described by the Lieb-Liniger model. This allows an interesting reinterpretation of interacting bosons in the context of anyons. We elaborate on this parallel, pa...
2017-11-15T10:00:00+00:00
Author(s): Lennart Bours, Stefano Guiducci, Alina Mreńca-Kolasińska, Bartłomiej Szafran, Jan C. Maan, and Stefan HeunWe show evidence of the backscattering of quantum Hall edge channels in a narrow graphene Hall bar, induced by the gating effect of the conducting tip of a scanning gate microscope, which we can position with nanometer precision. We show full control over the edge channels and are able, because of t...
2017-11-15T10:00:00+00:00
Author(s): Karim Essafi, Owen Benton, and L. D. C. JaubertThe kagome lattice is a paragon of geometrical frustration, long-studied for its association with novel ground states including spin liquids. Many recently synthesized kagome materials feature rare-earth ions, which may be expected to exhibit highly anisotropic exchange interactions. The consequence...
2017-11-15T10:00:00+00:00
Author(s): Mehedi Hasan, Dmitry Yudin, Ivan Iorsh, Olle Eriksson, and Ivan ShelykhStrong interaction with light may modify quantitatively the electronic properties of condensed matter systems. Here, the authors consider the classical example of topological electron states in a CdTe/HgTe/CdTe heterostructure and demonstrate that the coupling between electrons in a two-dimensional region and an external electromagnetic wave controls with high accuracy the normal and topological phases in the system. The electromagnetic radiation also modifies the properties of the edge states, which leads to the reversal of the edge spin currents. Importantly, all these effects can be realized in controllable and reversible way, and this has high potential impact for their integration of spintronics and optoelectronics.
(image)2017-11-15T10:00:00+00:00
Author(s): Alexander Herbig, Rolf Heid, and Robert EderWe report the development of an ab initio electronic structure method applicable to generic substitutionally disordered real materials. A charge self-consistent orbital-based extension of the coherent potential approximation due to Blackman, Esterling, and Berk (BEB-CPA) is combined with the mixed-b...
2017-11-15T10:00:00+00:00
Author(s): K. Dybko, M. Szot, A. Szczerbakow, M. U. Gutowska, T. Zajarniuk, J. Z. Domagala, A. Szewczyk, T. Story, and W. ZawadzkiWe demonstrate that the metallic topological surface states wrap on all sides the three-dimensional topological crystalline insulator SnTe. This is achieved by studying oscillatory quantum magnetotransport and magnetization at tilted magnetic fields, which enables us to observe simultaneous contribu...
2017-11-15T10:00:00+00:00
Author(s): Tomonori Shirakawa, Takami Tohyama, Jure Kokalj, Sigetoshi Sota, and Seiji YunokiTwo-dimensional density-matrix renormalization group method is employed to examine the ground-state phase diagram of the Hubbard model on the triangular lattice at half-filling. The calculation reveals two discontinuities in the double occupancy with increasing the repulsive Hubbard interaction $U$ ...
2017-11-15T10:00:00+00:00
Author(s): Ransell D'Souza and Sugata MukherjeeThe phonon dispersion, density of states, Grüneisen parameters, and the lattice thermal conductivity of single-layer and multilayer boron nitride were calculated using first-principles methods. For the bulk $h$-BN we also report the two-phonon density of states. We also present simple analytical sol...
2017-11-15T10:00:00+00:00
Author(s): Divya Somvanshi, Sangeeth Kallatt, Chenniappan Venkatesh, Smitha Nair, Garima Gupta, John Kiran Anthony, Debjani Karmakar, and Kausik MajumdarMonolayers of transition metal dichalcogenides (TMDCs) exhibit excellent electronic and optical properties. However, the performance of these two-dimensional (2D) devices are often limited by the large resistance offered by the metal contact interface. To date, the carrier injection mechanism from m...
2017-11-15T10:00:00+00:00
Author(s): Yuan Yao, Masahiro Sato, Tetsuya Nakamura, Nobuo Furukawa, and Masaki OshikawaEdge/surface states often appear in a topologically nontrivial phase when the system has a boundary. The edge state of a one-dimensional topological insulator is one of the simplest examples. Electron spin resonance (ESR) is an ideal probe to detect and analyze the edge state for its high sensitivit...
2017-11-14T10:00:00+00:00
Author(s): Yi Liu, Li-Shan Xie, Zhe Yuan, and Ke XiaWe combine the theoretical method of calculating spin wave excitation with the finite-temperature modeling of lattice vibration and calculate the magnon-phonon relaxation time in the technologically important material yttrium iron garnet (YIG) from first principles. The finite lifetime of magnon exc...
2017-11-14T10:00:00+00:00
Author(s): Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, and Y. TokuraWe demonstrate emergence of both the chiral soliton lattice and skyrmion lattice and investigate their magnetic-field variation in the strained ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ thin plate by means of small-angle resonant soft x-ray scattering. The tensile strain stabilizes a helical spin struc...
2017-11-14T10:00:00+00:00
Author(s): Jacob Shamblin, Zhiling Dun, Minseong Lee, Steve Johnston, Eun Sang Choi, Katharine Page, Yiming Qiu, and Haidong ZhouWe studied structural and magnetic ordering in ${\mathrm{Yb}}_{2}{\mathrm{TiO}}_{5}$ using synchrotron x-ray diffraction, neutron diffraction and total scattering, ac and dc susceptibility, and inelastic neutron scattering. Diffraction measurements reveal an average disordered fluorite structure wit...
2017-11-14T10:00:00+00:00
Author(s): Jinfeng Zeng, Shengshan Qin, Congcong Le, and Jiangping HuWe investigate the electronic and magnetic structures of the $122({AM}_{2}{B}_{2})$ hexagonal transition metal pnictides with $A=(\text{Sr},\text{Ca}),M=(\text{Cr},\text{Mn},\text{Fe},\text{Co},\text{Ni})$, and $B=(\text{As},\text{P},\text{Sb})$. It is found that the family of materials shares criti...
2017-11-14T10:00:00+00:00
Author(s): S. J. Kuhn, W. Morgenlander, E. R. Louden, C. Rastovski, W. J. Gannon, H. Takatsu, D. C. Peets, Y. Maeno, C. D. Dewhurst, J. Gavilano, and M. R. EskildsenDespite numerous studies the exact nature of the order parameter in superconducting ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ remains unresolved. We have extended previous small-angle neutron scattering studies of the vortex lattice in this material to a wider field range, higher temperatures, and with ...
2017-11-14T10:00:00+00:00
Author(s): V. D. Fil, M. P. Kolodyazhnaya, G. A. Zvyagina, I. V. Bilych, and K. R. ZhekovThe piezomagnetoelectric effect is considered to be the appearance of a piezoelectric response caused by a magnetic field in magnetically ordered media. The possibility of its existence in antiferromagnets was predicted in the 1960's; however, attempts at its experimental detection were unsuccessful...
2017-11-14T10:00:00+00:00
Author(s): M. Martens, G. Franco, N. S. Dalal, S. Bertaina, and I. ChiorescuWe discuss a general framework to address spin decoherence resulting from fluctuations in a spin Hamiltonian. We performed a systematic study on spin decoherence in the compound ${\mathrm{K}}_{6}[{\mathrm{V}}_{15}{\mathrm{As}}_{6}{\mathrm{O}}_{42}({\mathrm{D}}_{2}\mathrm{O})]\phantom{\rule{0.16em}{0...
2017-11-14T10:00:00+00:00
Author(s): Y. Ihara, T. Sasaki, N. Noguchi, Y. Ishii, M. Oda, and H. YoshidaThe low-energy magnetic excitations of the spin-$1/2$ kagome antiferromagnet ${\mathrm{CaCu}}_{3}{(\mathrm{OH})}_{6}{\mathrm{Cl}}_{2}·0.6{\mathrm{H}}_{2}\mathrm{O}$ (Ca-kapellasite) have been investigated by a $^{35}\mathrm{Cl}$ NMR experiment in fields up to 18.9 T. Recently, Ca-kapellasite was fou...
2017-11-14T10:00:00+00:00
Author(s): Wenlong Wang, Jonathan Machta, Humberto Munoz-Bauza, and Helmut G. KatzgraberThe question of the number of thermodynamic states present in the low-temperature phase of the three-dimensional Edwards-Anderson Ising spin glass is addressed by studying spin- and link-overlap distributions using population annealing Monte Carlo simulations. We consider overlaps between systems wi...
2017-11-14T10:00:00+00:00
Author(s): M. A. Tanatar, Yong Liu, J. Jaroszynski, J. S. Brooks, T. A. Lograsso, and R. ProzorovIn-plane resistivity measurements as a function of temperature and magnetic field up to 35 T with precise orientation within the crystallographic $ac$ plane were used to study the upper critical field ${H}_{c2}$ of the hole-doped iron-based superconductor ${\mathrm{Ba}}_{1−x}{\mathrm{K}}_{x}{\mathrm...
2017-11-14T10:00:00+00:00
Author(s): Yu Song, Weiyi Wang, Chenglin Zhang, Yanhong Gu, Xingye Lu, Guotai Tan, Yixi Su, Frédéric Bourdarot, A. D. Christianson, Shiliang Li, and Pengcheng DaiWe use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${\mathrm{NaFe}}_{0.9785}{\mathrm{Co}}_{0.0215}\mathrm{As}$, with coexisting superconductivity $({T}_{\mathrm{c}}≈19$ K) and weak ant...
2017-11-14T10:00:00+00:00
Author(s): Daisuke Ogura, Hideo Aoki, and Kazuhiko KurokiWe introduce the concept of “hidden ladders” for the bilayer Ruddlesden-Popper-type compounds: While the crystal structure is bilayer, ${d}_{xz}$ (${d}_{yz}$) orbitals in the relevant ${t}_{2g}$ sector of the transition metal form a two-leg ladder along $x$ ($y$) since the ${d}_{xz}$ (${d}_{yz}$) el...
2017-11-14T10:00:00+00:00
Author(s): Nicola Lanatà, Tsung-Han Lee, Yong-Xin Yao, and Vladimir DobrosavljevićWe develop a unified theoretical picture for excitations in Mott systems, portraying both the heavy quasiparticle excitations and the Hubbard bands as features of an emergent Fermi liquid state formed in an extended Hilbert space, which is nonperturbatively connected to the physical system. This obs...
2017-11-14T10:00:00+00:00
Author(s): Iris Cong, Meng Cheng, and Zhenghan WangDefects between gapped boundaries provide a possible physical realization of projective non-Abelian braid statistics. A notable example is the projective Majorana/parafermion braid statistics of boundary defects in fractional quantum Hall/topological insulator and superconductor heterostructures. In...
2017-11-14T10:00:00+00:00
Author(s): Sanjukta Paul, Ravindra Pankaj, Sudhakar Yarlagadda, Pinaki Majumdar, and Peter B. LittlewoodObtaining strong magnetoelectric couplings in bulk materials and heterostructures is an ongoing challenge. We demonstrate that manganite heterostructures of the form (Insulator) $/{({\mathrm{LaMnO}}_{3})}_{\mathrm{n}}/\mathrm{Interface}/{({\mathrm{CaMnO}}_{3})}_{\mathrm{n}}/(\mathrm{Insulator})$ sho...
2017-11-14T10:00:00+00:00
Author(s): Yuval Vinkler-Aviv, Piet W. Brouwer, and Felix von Oppen${\mathbb{Z}}_{4}$ parafermions can be realized in a strongly interacting quantum spin Hall Josephson junction or in a spin Hall Josephson junction strongly coupled to an impurity spin. In this paper, we study a system that has both features, but with weak (repulsive) interactions and a weakly coupl...
2017-11-14T10:00:00+00:00
Author(s): Run Yang, Zhiping Yin, Yilin Wang, Yaomin Dai, Hu Miao, Bing Xu, Xianggang Qiu, and Christopher C. HomesThe $\mathit{ab}$-plane optical properties of ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$ single crystals have been measured over a wide temperature and frequency range. Below ${T}^{*}≃155$ K, where this material undergoes an incoherent-coherent crossover, a new coherent response emerges in the optical co...
2017-11-14T10:00:00+00:00
Author(s): David J. ClarkeSpin-orbit coupled semiconducting nanowires with proximity-induced superconductivity are expected to host Majorana zero modes at their endpoints when a sufficiently strong magnetic field is applied. The resulting phase would be a one-dimensional topological superconductor. However, while a variety o...
2017-11-14T10:00:00+00:00
Author(s): Andreas Eberlein, Valentin Kasper, Subir Sachdev, and Julia SteinbergWe describe the nonequilibrium quench dynamics of the Sachdev-Ye-Kitaev models of fermions with random all-to-all interactions. These provide tractable models of the dynamics of quantum systems without quasiparticle excitations. The Kadanoff-Baym equations show that, at long times, the fermion two-p...
2017-11-14T10:00:00+00:00
Author(s): Cécile Repellin, Yin-Chen He, and Frank PollmannWe numerically study the spin-$\frac{1}{2}$ breathing kagome lattice. In this variation of the kagome Heisenberg antiferromagnet, the spins belonging to upward and downward facing triangles have different coupling strengths. Using the density matrix renormalization group (DMRG) method and exact diag...
2017-11-14T10:00:00+00:00
Author(s): M. Shahrokhvand, S. Pezzini, M. R. van Delft, U. Zeitler, N. E. Hussey, and S. WiedmannWe report on temperature-dependent magnetotransport experiments of ${\mathrm{SmB}}_{6}$ single crystals in high magnetic fields up to 33 T. Above the low-temperature plateau region in the zero-field resistivity, we find two distinct gapped regimes. The first is characterized by a temperature-indepen...
2017-11-14T10:00:00+00:00
Author(s): Le Huang, Lin Tao, Kai Gong, Yongtao Li, Huafeng Dong, Zhongming Wei, and Jingbo LiDensity functional theory calculations are performed to explore the nature of the contact between metal electrodes and defected monolayer ${\mathrm{MoSe}}_{2}$. Partial Fermi level pinning is observed at perfect ${\mathrm{MoSe}}_{2}$/metal interfaces. Both As- and Br-substituted ${\mathrm{MoSe}}_{2}...
2017-11-13T10:00:00+00:00
Author(s): Chad A. McCoy, Marcus D. Knudson, and Seth RootMeasurement of the Hugoniot and sound velocity provides information on the bulk modulus and Grüneisen parameter of a material at extreme conditions. The capability to launch multilayered (copper/aluminum) flyer plates at velocities in excess of 20 km/s with the Sandia Z accelerator has enabled high-...
2017-11-13T10:00:00+00:00
Author(s): Tobias Holder, Chia-Wei Huang, and Pavel M. OstrovskyWeyl semimetals are bulk materials with extreme spin-orbit coupling giving rise to gapless Dirac-like excitations. They exhibit a number of peculiar electronic properties owing to the topological nature of the spectrum. While weak disorder is known to be irrelevant in Weyl semimetals, recent theoretical studies have suggested that scattering from rare regions can give rise to a finite density of states at charge neutrality. The authors present a self-consistent theory, taking into account coherent scattering on multiple resonant impurities. The theory predicts relatively high density of states and conductivity at the Weyl point with a nonanalytic dependence on the impurity concentration.
(image)2017-11-13T10:00:00+00:00
Author(s): Zhihua Dong, Stephan Schönecker, Dengfu Chen, Wei Li, Mujun Long, and Levente VitosWe propose a first-principles framework for longitudinal spin fluctuations (LSFs) in disordered paramagnetic (PM) multicomponent alloy systems and apply it to investigate the influence of LSFs on the temperature dependence of two elastic constants of PM austenitic stainless steel Fe15Cr15Ni. The mag...
2017-11-13T10:00:00+00:00
Author(s): Nicolò Defenu, Andrea Trombettoni, István Nándori, and Tilman EnssThe study of the Berezinskii-Kosterlitz-Thouless transition in two-dimensional ${|φ|}^{4}$ models can be performed in several representations, and the amplitude-phase (AP) Madelung parametrization is a natural way to study the contribution of density fluctuations to nonuniversal quantities. We intro...
2017-11-13T10:00:00+00:00
Author(s): O. Vaccarelli, G. Rousse, A. Saúl, and G. RadtkeThe magnetic properties of ${\mathrm{Li}}_{2}{\mathrm{Cu}}_{2}\mathrm{O}{({\mathrm{SO}}_{4})}_{2}$ are investigated in the framework of density functional theory. In its high-temperature tetragonal structure, this compound appears as a rare material realization of a frustrated spin-1/2 two-leg ladde...
2017-11-13T10:00:00+00:00
Author(s): P. Wiecki, M. Nandi, A. E. Böhmer, S. L. Bud'ko, P. C. Canfield, and Y. FurukawaWe present $^{77}\mathrm{Se}$-NMR measurements on single-crystalline FeSe under pressures up to 2 GPa. Based on the observation of the splitting and broadening of the NMR spectrum due to structural twin domains, we discovered that static, local nematic ordering exists well above the bulk nematic ord...
2017-11-13T10:00:00+00:00
Author(s): Stephen Ragole, Haitan Xu, John Lawall, and Jacob M. TaylorThe mechanical force from light—radiation pressure—provides an intrinsically nonlinear interaction. Consequently, optomechanical systems near their steady state, such as the canonical optical spring, can display nonanalytic behavior as a function of external parameters. This nonanalyticity, a key fe...
2017-11-13T10:00:00+00:00
Author(s): Elisabeth M. Bothschafter, Elsa Abreu, Laurenz Rettig, Teresa Kubacka, Sergii Parchenko, Michael Porer, Christian Dornes, Yoav William Windsor, Mahesh Ramakrishnan, Aurora Alberca, Sebastian Manz, Jonathan Saari, Seyed M. Koohpayeh, Manfred Fiebig, Thomas Forrest, Philipp Werner, Sarnjeet S. Dhesi, Steven L. Johnson, and Urs StaubWe investigate the demagnetization dynamics of the cycloidal and sinusoidal phases of multiferroic ${\mathrm{TbMnO}}_{3}$ by means of time-resolved resonant soft x-ray diffraction following excitation by an optical pump. The use of orthogonal linear x-ray polarizations provides information on the co...
2017-11-13T10:00:00+00:00
Author(s): Mohmoud Rasly, Zhichao Lin, and Tetsuya UemuraWe electrically probed the transient response of nuclear spins in an $n$-GaAs channel by performing Hanle signal and spin-valve signal measurements on an all-electrical spin-injection device having a half-metallic spin source of $\mathrm{C}{\mathrm{o}}_{2}\mathrm{MnSi}$. Furthermore, we simulated th...