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Published: 2017-09-22T15:35:57+00:00
2017-09-22T10:00:00+00:00
Author(s): S. Chakraborty, P. Boolchand, and M. MicoulautWe investigate the amorphous ${\mathrm{Ge}}_{x}{\mathrm{S}}_{100−x}$ (with $10≤x≤40)$ system from ab initio simulations. Results show a very good agreement with experimental findings from diffraction and the topology of the obtained structural models is further analyzed and compared with the selenid...
2017-09-22T10:00:00+00:00
Author(s): Matti Silveri, Hermann Grabert, Shumpei Masuda, Kuan Yen Tan, and Mikko MöttönenWe focus on a recently experimentally realized scenario of normal-metal–insulator–superconductor tunnel junctions coupled to a superconducting resonator. We develop a first-principles theory to describe the effect of photon-assisted electron tunneling on the quantum state of the resonator. Our resul...
2017-09-22T10:00:00+00:00
Author(s): Ádám Butykai, Sándor Bordács, László F. Kiss, Bertalan György Szigeti, Vladimir Tsurkan, Alois Loidl, and István KézsmárkiWe report on the slow magnetization dynamics observed upon the magnetic phase transitions of ${\mathrm{GaV}}_{4}{\mathrm{S}}_{8}$, a multiferroic compound featuring a long-ranged cycloidal magnetic order and a Néel-type skyrmion lattice in a relatively broad temperature range below its Curie tempera...
2017-09-22T10:00:00+00:00
Author(s): Yali Yang, Hongjun Xiang, Hongjian Zhao, Alessandro Stroppa, Jincang Zhang, Shixun Cao, Jorge Íñiguez, L. Bellaiche, and Wei RenFirst-principles calculations are performed on magnetic multidomain structures in the $\mathrm{SmFe}{\mathrm{O}}_{3}$ rare-earth orthoferrite compound. We focus on the magnetic symmetry breaking at (001)-oriented antiphase domain walls, treating magnetism in the simplest (collinear) approximation wi...
2017-09-22T10:00:00+00:00
Author(s): M. P. Smylie, K. Willa, H. Claus, A. Snezhko, I. Martin, W.-K. Kwok, Y. Qiu, Y. S. Hor, E. Bokari, P. Niraula, A. Kayani, V. Mishra, and U. WelpWe present resistivity and magnetization measurements on proton-irradiated crystals demonstrating that the superconducting state in the doped topological insulator ${\mathrm{Nb}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ ($x=0.25$) is surprisingly robust against disorder-induced electron scattering. Th...
2017-09-22T10:00:00+00:00
Author(s): Chong Wang, Xiaoyu Liu, Lei Kang, Bing-Lin Gu, Yong Xu, and Wenhui DuanVarious nonlinear optical (NLO) responses, like shift current and second harmonic generation (SHG), are revealed to be closely related to topological quantities involving the Berry connection and Berry curvature. First-principles prediction of NLO responses is of great importance to fundamental rese...
2017-09-22T10:00:00+00:00
Author(s): Kenji Ishii, Takami Tohyama, Shun Asano, Kentaro Sato, Masaki Fujita, Shuichi Wakimoto, Kenji Tustsui, Shigetoshi Sota, Jun Miyawaki, Hideharu Niwa, Yoshihisa Harada, Jonathan Pelliciari, Yaobo Huang, Thorsten Schmitt, Yoshiya Yamamoto, and Jun'ichiro MizukiWe investigate electronic excitations in ${\mathrm{La}}_{2−x}{(\mathrm{Br},\mathrm{Sr})}_{x}{\mathrm{CuO}}_{4}$ using resonant inelastic x-ray scattering (RIXS) at the oxygen $K$ edge. RIXS spectra of the hole-doped cuprates show clear momentum dependence below 1 eV. The broad spectral weight exhibi...
2017-09-22T10:00:00+00:00
Author(s): Thomas OlsenThe random phase approximation (RPA) for total energies has previously been shown to provide a qualitatively correct description of static correlation in molecular systems, where density functional theory (DFT) with local functionals are bound to fail. This immediately poses the question of whether ...
2017-09-22T10:00:00+00:00
Author(s): Daniel Otten and Fabian HasslerEven at zero temperature dissipation reduces quantum fluctuations and tends to localize particles. A notable exception is the nonlinear dissipation due to quasiparticle tunneling in a Josephson junction. It is well known that quasiparticle dissipation does not suppress tunneling of the superconducti...
2017-09-21T10:00:00+00:00
Author(s): Elsa Abreu, Stephanie N. Gilbert Corder, Sun Jin Yun, Siming Wang, Juan Gabriel Ramírez, Kevin West, Jingdi Zhang, Salinporn Kittiwatanakul, Ivan K. Schuller, Jiwei Lu, Stuart A. Wolf, Hyun-Tak Kim, Mengkun Liu, and Richard D. AverittUltrafast optical pump–optical probe and optical pump–terahertz probe spectroscopy were performed on vanadium dioxide (${\mathrm{VO}}_{2}$) and vanadium sesquioxide (${\mathrm{V}}_{2}{\mathrm{O}}_{3}$) thin films over a wide temperature range. A comparison of the experimental data from these two dif...
2017-09-21T10:00:00+00:00
Author(s): B. S. Holinsworth, H. Sims, J. G. Cherian, D. Mazumdar, N. C. Harms, B. C. L. Chapman, A. Gupta, S. A. McGill, and J. L. MusfeldtWe bring together magnetic circular dichroism, photoconductivity, and complementary first-principles calculations in order to unravel spin-charge interactions in the high Curie temperature magnet ${\mathrm{NiFe}}_{2}{\mathrm{O}}_{4}$. Analysis uncovers a massive set of well-isolated spin-down states...
2017-09-21T10:00:00+00:00
Author(s): Simone Borlenghi, M. R. Mahani, Hans Fangohr, M. Franchin, Anna Delin, and Jonas FranssonWe present a simple and fast method to simulate spin-torque driven magnetization dynamics in nanopillar spin-valve structures. The approach is based on the coupling between a spin transport code based on random matrix theory and a micromagnetics finite-elements software. In this way the spatial depe...
2017-09-21T10:00:00+00:00
Author(s): B. Meir, S. Gorol, T. Kopp, and G. HammerlLead-doped barium bismuthate is intriguing because of its relatively high critical temperature and the nature of its superconductivity in the vicinity of a charge-density-wave-ordered topological insulator. Here we present bilayers of barium bismuthate and barium leadate showing emergent superconduc...
2017-09-21T10:00:00+00:00
Author(s): D. M. Polishchuk, Yu. O. Tykhonenko-Polishchuk, E. Holmgren, A. F. Kravets, and V. KorenivskiWe demonstrate sharp thermally induced switching between ferromagnetic and antiferromagnetic RKKY (Ruderman-Kittel-Kasuya-Yosida) exchange in a spin-valve with the spacer incorporating a thin diluted ferromagnetic layer as the core. We illustrate the mechanism behind the effect as being due to a cha...
2017-09-21T10:00:00+00:00
Author(s): Oscar Fabelo, J. Alberto Rodríguez-Velamazán, Laura Canadillas-Delgado, Lidia Mazzuca, Javier Campo, Ángel Millán, Laurent C. Chapon, and Juan Rodríguez-Carvajal${\mathrm{Cs}}_{2}{\mathrm{FeCl}}_{5}·{\mathrm{D}}_{2}\mathrm{O}$ has been identified as a linear magnetoelectric material, although the correlation of this property with the magnetic structures of this compound has not been adequately studied. We have used single-crystal and powder neutron diffract...
2017-09-21T10:00:00+00:00
Author(s): Kazuhiro Nawa, Oleg Janson, and Zenji HiroiWe investigated magnetic and thermodynamic properties of $S=\frac{1}{2}$ quasi-one-dimensional antiferromagnet ${\mathrm{KCuMoO}}_{4}(\mathrm{OH})$ through single-crystalline magnetization and heat capacity measurements. At zero field, it behaves as a uniform $S=\frac{1}{2}$ Heisenberg antiferromagn...
2017-09-21T10:00:00+00:00
Author(s): Zhihao Lan and Stephen PowellWe use exact diagonalization to study the eigenstate thermalization hypothesis (ETH) in the quantum dimer model on the square and triangular lattices. Due to the nonergodicity of the local plaquette-flip dynamics, the Hilbert space, which consists of highly constrained close-packed dimer configurati...
2017-09-21T10:00:00+00:00
Author(s): Zhanghui Chen, Jingbo Li, Shushen Li, and Lin-Wang WangAb initio atomic relaxations often take large numbers of steps and long times to converge, especially when the initial atomic configurations are far from the local minimum or there are curved and narrow valleys in the multidimensional potentials. An atomic relaxation method based on on-the-flight fo...
2017-09-21T10:00:00+00:00
Author(s): S. V. Anishchik and K. L. IvanovWe report a study of the magnetic field dependence of photoluminescence of ${\mathrm{NV}}^{−}$ centers (negatively charged nitrogen vacancy centers) in diamond single crystals. In such a magnetic field dependence characteristic sharp features are observed, which are coming from level anticrossings (...
2017-09-21T10:00:00+00:00
Author(s): Jing Fei Yu, Attila Bartha, Jeroen Custers, and Stephen R. JulianWe report on the results of a de Haas–van Alphen (dHvA) measurement performed on the recently discovered antiferromagnet ${\mathrm{URhIn}}_{5}$ (${T}_{N}=98$ K), a $5f$ analog of the well studied heavy fermion antiferromagnet ${\mathrm{CeRhIn}}_{5}$. We observe two small Fermi surfaces: a roughly sp...
2017-09-21T10:00:00+00:00
Author(s): V. Gnezdilov, Yu. Pashkevich, P. Lemmens, V. Kurnosov, P. Berdonosov, V. Dolgikh, E. Kuznetsova, V. Pryadun, K. Zakharov, and A. VasilievSpecific heat $C$, thermal conductivity κ, dielectric permittivity ε, electric polarization $P$, and Raman scattering experiments are performed on $\mathrm{C}{\mathrm{u}}_{3}\mathrm{Bi}{(\mathrm{Se}{\mathrm{O}}_{3})}_{2}{\mathrm{O}}_{2}X$ ($X=\mathrm{Br},\phantom{\rule{0.28em}{0ex}}\mathrm{Cl}$) sin...
2017-09-21T10:00:00+00:00
Author(s): E. C. Goldberg and F. FloresInelastic spin excitations, as observed with a scanning tunneling microscope for Co/Co and Fe/Fe dimers on a Cu2N/Cu(100) surface, have been analyzed theoretically in this paper. In our approach, we use an extended ionic Hamiltonian for the magnetic atom that takes into account first, the role playe...
2017-09-21T10:00:00+00:00
Author(s): Cheng-Zhen Wang, Hong-Ya Xu, Liang Huang, and Ying-Cheng LaiRecently, solid state materials hosting pseudospin-1 quasiparticles have attracted a great deal of attention. In these materials, the energy band contains a pair of Dirac cones and a flatband through the connecting point of the cones. As the “caging” of carriers with a zero group velocity, the flatb...
2017-09-21T10:00:00+00:00
Author(s): R. Nourafkan and A.-M. S. TremblayThe orbital basis is natural when one needs to calculate the effect of local interactions or to unravel the role of orbital physics in the response to external probes. In systems with nonsymmorphic point groups, such as the iron-based superconductors, we show that symmetries that emerge in observabl...
2017-09-21T10:00:00+00:00
Author(s): Jan Heyder, Florian Bauer, Dennis Schimmel, and Jan von DelftWe present a Keldysh-based derivation of a formula, previously obtained by Oguri using the Matsubara formalism, for the linear conductance through a central, interacting region coupled to noninteracting fermionic leads. Our starting point is the well-known Meir-Wingreen formula for the current, whos...
2017-09-21T10:00:00+00:00
Author(s): M. Mirzakhani, M. Zarenia, P. Vasilopoulos, S. A. Ketabi, and F. M. PeetersThe electron energy spectrum in monolayer-bilayer-monolayer and in bilayer-monolayer-bilayer graphene structures is investigated and the effects of a perpendicular magnetic field and electric bias are studied. Different types of monolayer-bilayer interfaces are considered as zigzag (ZZ) or armchair ...
2017-09-21T10:00:00+00:00
Author(s): A. M. Valencia and M. J. CaldasMagnetic properties of a single vacancy in graphene is a relevant and still much discussed problem. The experimental results point to a clearly detectable magnetic defect state at the Fermi energy, while calculations based on density functional theory (DFT) yield widely varying results for the magne...
2017-09-21T10:00:00+00:00
Author(s): Zu-Quan Zhang and Jing-Tao LüUsing the nonequilibrium Green's function method, we consider heat transport in an insulating ferromagnetic spin chain model with spin-phonon interaction under an external magnetic field. Employing the Holstein-Primakoff transformation to the spin system, we treat the resulted magnon-phonon interact...
2017-09-20T10:00:00+00:00
Author(s): Magnus Moreau, Astrid Marthinsen, Sverre M. Selbach, and Thomas TybellStrain-phonon coupling, in terms of the shift in phonon frequencies under biaxial strain, is studied by density functional theory calculations for 20 perovskite oxides strained in their (111) and (001) planes. While the strain-phonon coupling under (001) strain follows the established, intuitive tre...
2017-09-20T10:00:00+00:00
Author(s): J. Keski-Rahkonen, P. J. J. Luukko, L. Kaplan, E. J. Heller, and E. RäsänenQuantum scars are enhancements of quantum probability density along classical periodic orbits. We study the recently discovered phenomenon of strong perturbation-induced quantum scarring in the two-dimensional harmonic oscillator exposed to a homogeneous magnetic field. We demonstrate that both the ...
2017-09-20T10:00:00+00:00
Author(s): K. Nakatsugawa, T. Fujii, and S. TandaWe show that time translation symmetry of a ring system with a macroscopic quantum ground state is broken by decoherence. In particular, we consider a ring-shaped incommensurate charge density wave (ICDW ring) threaded by a fluctuating magnetic flux: the Caldeira-Leggett model is used to model the f...
2017-09-20T10:00:00+00:00
Author(s): Shinobu Ohya, Akiyori Yamamoto, Tomonari Yamaguchi, Ryo Ishikawa, Ryota Akiyama, Le Duc Anh, Shobhit Goel, Yuki K. Wakabayashi, Shinji Kuroda, and Masaaki TanakaTopological crystalline insulator SnTe is a promising material for future spintronics applications because of the strong spin-orbit coupling and surface states protected by the mirror symmetry of the crystal. In this paper, using a high-quality epitaxial (001)-oriented Fe/SnTe/CdTe/ZnTe heterostruct...
2017-09-20T10:00:00+00:00
Author(s): M. Orendáč, R. Tarasenko, V. Tkáč, A. Orendáčová, and V. SechovskýMagnetocaloric effect in the Haldane-gap $S=1$ spin-chain $[\mathrm{Ni}{({\mathrm{C}}_{2}{\mathrm{H}}_{8}{\mathrm{N}}_{2})}_{2}{\mathrm{NO}}_{2}]({\mathrm{BF}}_{4})$ was investigated at low temperatures $({k}_{B}T≪J)$ and magnetic fields up to nominally $0.1{B}_{\mathrm{sat}}$, where $J$ and ${B}_{\...
2017-09-20T10:00:00+00:00
Author(s): David S. Ellis, Eugen Weschke, Asaf Kay, Daniel A. Grave, Kirtiman Deo Malviya, Hadar Mor, Frank M. F. de Groot, Hen Dotan, and Avner RothschildThe spin states at the surface of epitaxial thin films of hematite, both undoped and doped with 1% Ti, Sn, or Zn, respectively, were probed with x-ray magnetic linear dichroism (XMLD) spectroscopy. Morin transitions were observed for the undoped $({T}_{M}≈200$ K) and Sn-doped $({T}_{M}≈300$ K) cases...
2017-09-20T10:00:00+00:00
Author(s): B. J. Powell, J. Merino, A. L. Khosla, and A. C. Jacko2017-09-20T10:00:00+00:00
Author(s): Jiban Kangsabanik, Rajiv K. Chouhan, D. D. Johnson, and Aftab AlamGold iron (Au-Fe) alloys are of immense interest due to their biocompatibility, anomalous Hall conductivity, and applications in various medical treatments. However, irrespective of the method of preparation, they often exhibit a high level of disorder with properties sensitive to the thermal or mag...
2017-09-20T10:00:00+00:00
Author(s): Zu-Jian Ying, Mario Cuoco, Carmine Ortix, and Paola GentileWe investigate the nature of the superconducting (SC) state in curved nanostructures with Rashba spin-orbit coupling (RSOC). In bent nanostructures with inhomogeneous curvature we find a local enhancement or suppression of the SC order parameter, with the effect that can be tailored by tuning either...
2017-09-20T10:00:00+00:00
Author(s): Fei Xue, Xueyun Wang, Yin Shi, Sang-Wook Cheong, and Long-Qing ChenAn incommensurate phase refers to a solid state in which the period of a superstructure is incommensurable with its primitive unit cell. It was recently shown that an incommensurate phase, which displays a single chiral modulation of six domain variants, could be induced by applying an in-plane stra...
2017-09-20T10:00:00+00:00
Author(s): Adhip Agarwala and Diptiman SenWe periodically kick a local region in a one-dimensional lattice and demonstrate, by studying wave packet dynamics, that the strength and the time period of the kicking can be used as tuning parameters to control the transmission probability across the region. Interestingly, we can tune the transmis...
2017-09-20T10:00:00+00:00
Author(s): Yahor Savich, Leonid Glazman, and Alex KamenevWe examine energy relaxation of nonequilibrium quasiparticles in “dirty” superconductors with the electron mean free path much shorter than the superconducting coherence length. Relaxation of low-energy nonequilibrium quasiparticles is dominated by phonon emission. We derive the corresponding collis...
2017-09-20T10:00:00+00:00
Author(s): Laura Classen, Igor F. Herbut, and Michael M. SchererThermal phase transitions are successfully described by fluctuations of an appropriate order parameter, which further allows classification of the transition into first or second order. However, some quantum analogs of thermal phase transitions defy this description and identifying the mechanisms behind these unconventional processes will fundamentally improve our understanding of matter. Here, the authors provide a thorough study of such a transition, which has been experimentally accessed in graphene: the emergence of a Kekulé valence bond solid. Additional gapless quantum fluctuations of Dirac electrons change the nature of this transition from first to second order. Using a nonperturbative functional renormalization group approach, the authors advance the state-of-the-art estimates for the corresponding critical exponents and predict measurable corrections to scaling.
(image)2017-09-20T10:00:00+00:00
Author(s): Scott Geraedts and Olexei I. MotrunichWe provide an explicit lattice model of bosons with two separately conserved boson species $[U(1)×U(1)$ global symmetry] realizing a direct transition between an integer quantum Hall effect of bosons and a trivial phase, where any intermediate phase is avoided by an additional symmetry interchanging...
2017-09-20T10:00:00+00:00
Author(s): H. Gretarsson, J. Sauceda, N. H. Sung, M. Höppner, M. Minola, B. J. Kim, B. Keimer, and M. Le TaconSr${}_{2}$IrO${}_{4}$ is considered as a strong spin-orbit coupled equivalent of high-temperature superconducting cuprates. Recent experiments have most notably shown that upon electron doping a pseudogap emerges in Sr${}_{2}$IrO${}_{4}$ and that magnonlike excitations survive the rapid disappearance of long-range magnetic order. However, due to the relatively small crystal sizes and the large Ir neutron cross section, information on charge excitations and magnetism has mostly been gathered using synchrotron-based spectroscopic methods. Here, the authors use Raman scattering on electron-doped Sr${}_{2-x}$La${}_{x}$IrO${}_{4}$ single crystals to carry out a temperature and doping study of the lattice and magnetic excitations, and observe the emergence upon doping of an electron-hole continuum that couples to the phonons. Even in metallic samples, fluctuating magnetic moments and mobile carriers therefore coexist, again in close analogy with the doped cuprates.
(image)2017-09-20T10:00:00+00:00
Author(s): Benedikt Herwerth, Germán Sierra, J. Ignacio Cirac, and Anne E. B. NielsenWe study states of one- and two-dimensional spin systems that are constructed as correlators within the conformal field theory of a massless, free boson. In one dimension, these are good variational wave functions for $XXZ$ spin chains, and they are similar to lattice Laughlin states in two dimensio...
2017-09-20T10:00:00+00:00
Author(s): D. R. Mortensen, G. T. Seidler, Joshua J. Kas, Niranjan Govind, Craig P. Schwartz, Sri Pemmaraju, and David G. PrendergastWe report measurement of the valence-to-core (VTC) region of the K-shell x-ray emission spectra from several Zn and Fe inorganic compounds, and their critical comparison with three existing theoretical treatments. We find generally good agreement between the respective theories and experiment and in...
2017-09-20T10:00:00+00:00
Author(s): P. Haldar, M. S. Laad, and S. R. HassanThe celebrated Wiedemann-Franz (WF) law is believed to be robust in metals as long as interactions between electrons preserve their fermion-quasiparticle character. We study thermal transport and the fate of the WF law close to a continuous metal-insulator transition (MIT) in the Falicov-Kimball mod...
2017-09-20T10:00:00+00:00
Author(s): Xiang-Long Yu, Da-Yong Liu, Ya-Min Quan, Jiansheng Wu, Hai-Qing Lin, Kai Chang, and Liang-Jian ZouIn this paper, we present the electronic structures and orbital-resolved electronic properties of structurally distorted $1T\text{−}{\mathrm{TaS}}_{2}$ bulk and monolayer within density functional theory approaches. The relaxed commensurate-charge-density-wave (CCDW) structure shows that 13 Ta atoms...
2017-09-20T10:00:00+00:00
Author(s): S. Verret, O. Simard, M. Charlebois, D. Sénéchal, and A.-M. S. TremblayAn elegant way to probe the mysterious “pseudogap” state in cuprates is to suppress superconductivity with strong magnetic fields and work at low temperature. Then, impurity scattering dominates, which simplifies calculations. A number of theories thus successfully explain the sudden change in carrier number observed experimentally. To tell these theories apart, the work here provides new predictions. First, it shows how electron pockets cause strong signatures in the specific heat and Seebeck coefficient. Second, it addresses inconsistencies in scattering rate approximations for the Hall and the Seebeck effects. Third, it shows the influence of the Van Hove singularity on these quantities.
(image)2017-09-20T10:00:00+00:00
Author(s): Sara Fiori, Yuya Murata, Stefano Veronesi, Antonio Rossi, Camilla Coletti, and Stefan HeunWe present a systematical study via scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) on the effect of the exposure of lithium on graphene on silicon carbide (SiC). We have investigated Li deposition both on epitaxial monolayer graphene and on buffer layer surfaces on th...
2017-09-19T10:00:00+00:00
Author(s): Michael Sekania, Stephan Plugge, Martin Greiter, Ronny Thomale, and Peter SchmitteckertAvenues of Majorana bound states (MBSs) have become one of the primary directions towards a possible realization of topological quantum computation. For a Y junction of Kitaev quantum wires, we numerically investigate the braiding of MBSs while considering the full quasiparticle background. The two ...
2017-09-19T10:00:00+00:00
Author(s): Alexander A. Tsirlin, Ioannis Rousochatzakis, Dmitry Filimonov, Dmitry Batuk, Matthias Frontzek, and Artem M. AbakumovWe show that interlayer spins play a dual role in the Cairo pentagonal magnet ${\mathrm{Bi}}_{4}{\mathrm{Fe}}_{5}{\mathrm{O}}_{13}\mathrm{F}$, on one hand mediating the three-dimensional magnetic order, and on the other driving spin-reorientation transitions both within and between the planes. The c...
2017-09-19T10:00:00+00:00
Author(s): Shukai Yu, C. Dhanasekhar, Venimadhav Adyam, Skylar Deckoff-Jones, Michael K. L. Man, Julien Madéo, E Laine Wong, Takaaki Harada, M. Bala Murali Krishna, Keshav M. Dani, and Diyar TalbayevWe present a study of the terahertz-frequency magnetoelectric effect in ferrimagnetic pyroelectric ${\mathrm{CaBaCo}}_{4}{\mathrm{O}}_{7}$ and its Ni-doped variants. The terahertz absorption spectrum of these materials consists of spin excitations and low-frequency infrared-active phonons. We studie...
2017-09-19T10:00:00+00:00
Author(s): Rosa Mach-Batlle, Albert Parra, Jordi Prat-Camps, Sergi Laut, Carles Navau, and Alvaro SanchezThe control of magnetic fields, essential for our science and technology, is currently achieved by magnetic materials with positive permeability, including ferromagnetic, paramagnetic, and diamagnetic types. Here we introduce materials with negative static permeability as a new paradigm for manipula...
2017-09-19T10:00:00+00:00
Author(s): H. C. Walker, H. D. Duncan, M. D. Le, D. A. Keen, D. J. Voneshen, and A. E. PhillipsWe report the magnetic diffraction pattern and spin-wave excitations in ${(\mathrm{CD}}_{3}{)}_{2}{\mathrm{ND}}_{2}{[{\mathrm{Mn}(\mathrm{DCO}}_{2})}_{3}]$ measured using elastic and inelastic neutron scattering. The magnetic structure is shown to be a $G$-type antiferromagnet with moments pointing ...
2017-09-19T10:00:00+00:00
Author(s): Masahiro Nabeta, Kenta K. Tanaka, Seiichiro Onari, and Masanori IchiokaThe roles of paramagnetic and diamagnetic pair-breaking effects in superconductivity in the electric-field-induced surface metallic state are studied using the Bogoliubov–de Gennes equation when magnetic fields are applied parallel to the surface. The multigap states of the subbands are related to t...
2017-09-19T10:00:00+00:00
Author(s): M. Moroni, L. Gozzelino, G. Ghigo, M. A. Tanatar, R. Prozorov, P. C. Canfield, and P. CarrettaWe present a $^{75}\mathrm{As}$ nuclear magnetic resonance (NMR) and resistivity study of the effect of 5.5 MeV proton irradiation on the optimal electron doped $(x=0.068)$ and overdoped $(x=0.107)$ $\mathrm{Ba}{({\mathrm{Fe}}_{1−x}{\mathrm{Rh}}_{x})}_{2}{\mathrm{As}}_{2}$ iron based superconductors...
2017-09-19T10:00:00+00:00
Author(s): Takuro Nagai, Koji Kimoto, Koji Inoke, and Masaki TakeguchiNanoscale magnetic phase separation in dysprosium has been revealed by aberration-corrected Lorentz microscopy. The in-plane magnetization distribution of the coexisting magnetic phases has been visualized successfully by combining high-resolution Lorentz microscopy with the transport-of-intensity equation method. The phase separation of the ferromagnetic and the helical antiferromagnetic (HAFM) phases results in the formation of static magnetic solitons at around 130 K in the absence of external magnetic field. External fields of up to about 11 kOe induce nanoscale phase separation of the HAFM, the distorted HAFM, and the fan phases at 142 K. The developed technique for the high-resolution observation of fine magnetic structures is a valuable addition to the modern toolbox of magnetic materials research.
(image)2017-09-19T10:00:00+00:00
Author(s): F. Setiawan, Dong-Ling Deng, and J. H. PixleyWe theoretically study transport properties in one-dimensional interacting quasiperiodic systems at infinite temperature. We compare and contrast the dynamical transport properties across the many-body localization (MBL) transition in quasiperiodic and random models. Using exact diagonalization we c...
2017-09-19T10:00:00+00:00
Author(s): Graeme W. MiltonHere, we obtain explicit formulas for bounds on the complex electrical polarizability at a given frequency of an inclusion with known volume that follow directly from the quasistatic bounds of Bergman and Milton on the effective complex dielectric constant of a two-phase medium. We also describe how...
2017-09-19T10:00:00+00:00
Author(s): S. Borroni, E. Baldini, V. M. Katukuri, A. Mann, K. Parlinski, D. Legut, C. Arrell, F. van Mourik, J. Teyssier, A. Kozlowski, P. Piekarz, O. V. Yazyev, A. M. Oleś, J. Lorenzana, and F. CarboneSymmetry breaking across phase transitions often causes changes in selection rules and emergence of optical modes which can be detected via spectroscopic techniques or generated coherently in pump-probe experiments. In second-order or weakly first-order transitions, fluctuations of the ordering fiel...
2017-09-19T10:00:00+00:00
Author(s): P. A. Pantazopoulos, N. Stefanou, E. Almpanis, and N. PapanikolaouThe interaction of visible and near-infrared light with spin waves in appropriately designed dual nanocavities, for both photons and magnons, is investigated by means of rigorous calculations, correct to arbitrary order in the magneto-optical coupling parameter. It is shown that the concurrent local...
2017-09-19T10:00:00+00:00
Author(s): Erik Brok, Kim Lefmann, Gøran Jan Nilsen, Mathias Kure, and Cathrine FrandsenNeutron diffraction is a powerful technique for determining the magnetic structure of antiferromagnetic materials. However, for some of these, determining the detailed magnetic structure remains a challenge. In goethite ($α$-FeOOH) the antiferromagnetic unit cell coincides with the chemical unit cel...
2017-09-19T10:00:00+00:00
Author(s): J. C. Petersen, A. Farahani, D. G. Sahota, Ruixing Liang, and J. S. DodgeWe establish a detailed phenomenology of photocarrier transport in the copper oxide plane by studying the transient terahertz photoconductivity of ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{2}{\mathrm{Cl}}_{2}$ and ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6}$. The peak photoconductivity saturates wi...
2017-09-19T10:00:00+00:00
Author(s): Dillon C. Yost, Yi Yao, and Yosuke KanaiIn ion irradiation processes, electronic stopping power describes the energy transfer rate from the irradiating ion to the target material's electrons. Due to the scarcity and significant uncertainties in experimental electronic stopping power data for materials beyond simple solids, there has been ...
2017-09-19T10:00:00+00:00
Author(s): Yannic Utz, Franziska Hammerath, Roberto Kraus, Tobias Ritschel, Jochen Geck, Liviu Hozoi, Jeroen van den Brink, Ashwin Mohan, Christian Hess, Koushik Karmakar, Surjeet Singh, Dalila Bounoua, Romuald Saint-Martin, Loreynne Pinsard-Gaudart, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim GrafeThe $S=1/2$ Heisenberg spin chain compound ${\mathrm{SrCuO}}_{2}$ doped with different amounts of nickel (Ni), palladium (Pd), zinc (Zn), and cobalt (Co) has been studied by means of Cu nuclear magnetic resonance (NMR). Replacing only a few of the $S=1/2$ Cu ions with Ni, Pd, Zn, or Co has a major i...
2017-09-19T10:00:00+00:00
Author(s): Wei Tang, Lei Chen, Wei Li, X. C. Xie, Hong-Hao Tu, and Lei WangIn addition to the celebrated Affleck-Ludwig entropy originating from the open boundaries of the path-integral manifold, recent research has shown that the entropy correction on nonorientable manifolds such as the Klein bottle is also a universal characterization of critical systems with an emergent conformal field theory (CFT). Here, the authors show that the Klein bottle entropy can be interpreted as a boundary effect by transforming the Klein bottle into an orientable manifold, whereby the Klein bottle entropy bears a resemblance to the Affleck-Ludwig entropy. The authors then propose a generic scheme to extract these universal boundary entropies from lattice models. Numerical results for the $q$-state Potts model are compared with the CFT predictions.
(image)2017-09-19T10:00:00+00:00
Author(s): Wen-Xiao Wang, Hua Jiang, Yu Zhang, Si-Yu Li, Haiwen Liu, Xinqi Li, Xiaosong Wu, and Lin HeFinite-size twisted bilayer graphene (TBG, where here the TBG is of nanoscale size) is quite unstable and will change its structure to a Bernal (or $AB$-stacking) bilayer with a much lower energy. Therefore, the lack of finite-size TBG makes its electronic properties difficult to access in experimen...
2017-09-19T10:00:00+00:00
Author(s): L. Fry-Bouriaux, M. C. Rosamond, D. A. Williams, A. G. Davies, and C. WältiMetal-insulator-metal structures based on ultrathin high-$k$ dielectric films are underpinning a rapidly increasing number of devices and applications. Here, we report detailed electrical characterizations of asymmetric metal-insulator-metal devices featuring atomic layer deposited 2-nm-thick ${\mat...
2017-09-19T10:00:00+00:00
Author(s): Mahdiyeh Sadrara and MirFaez MiriThe interaction of light with a cluster of gyrotropic spherical particles is studied in view of a miniaturized Faraday rotator. The electromagnetic fields are expanded in terms of the vector multipole fields and the expansion of the scattered field is related to that of the incident field. An incide...
2017-09-19T10:00:00+00:00
Author(s): Rajesh K. Malla and M. E. RaikhWe consider the simplest nonintegrable model of the multistate Landau-Zener transition. In this model, two pairs of levels in two tunnel-coupled quantum dots are swept past each other by the gate voltage. Although this $2×2$ model is nonintegrable, it can be solved analytically in the limit when the...
2017-09-19T10:00:00+00:00
Author(s): Cristian M. Teodorescu, Lucian Pintilie, Nicoleta G. Apostol, Ruxandra M. Costescu, George A. Lungu, Luminiţa Hrib, Lucian Trupină, Liviu C. Tănase, Ioana C. Bucur, and Amelia E. BocîrneaThe positions of the low energy electron diffraction (LEED) spots from ferroelectric single crystal films depend on its polarization state, due to electric fields generated outside of the sample. One may derive the surface potential energy, yielding the depth where the mobile charge carriers compens...
2017-09-19T10:00:00+00:00
Author(s): Rina Takashima, Satoshi Fujimoto, and Takehito YokoyamaWe study spin-transfer torques induced by a spin-triplet supercurrent in a magnet with the superconducting proximity effect. By a perturbative approach, we show that spin-triplet correlations realize new types of torques, which are analogous to the adiabatic and nonadiabatic ($β$) torques, without e...
2017-09-19T10:00:00+00:00
Author(s): Pierluigi Cudazzo and Matteo Gatti${\mathrm{Ca}}_{2}\mathrm{N}$ is a layered material that has been recently identified as a two-dimensional (2D) electride, an unusual ionic compound in which electrons serve as anions. The electronic properties of 2D electrides attract considerable interest as the anionic electrons, which form a 2D ...
2017-09-19T10:00:00+00:00
Author(s): Yongchao Jia, Anna Miglio, Samuel Poncé, Masayoshi Mikami, and Xavier GonzeThe luminescence of fifteen representative ${\mathrm{Eu}}^{2+}$-doped phosphors used for white-LED and scintillation applications is studied through a constrained density functional theory. Transition energies and Stokes shift are deduced from differences of total energies between the ground and exc...
2017-09-19T10:00:00+00:00
Author(s): A. Ourir, A. Maurel, S. Félix, J.-F. Mercier, and M. FinkWe study the defect-guided modes supported by a set of metallic rods structured at the subwavelength scale. Following the idea of photonic crystal waveguide, we show that spoof plasmon surface waves can be manipulated at subwavelength scale. We demonstrate that these waves can propagate without leak...
2017-09-19T10:00:00+00:00
Author(s): Kun Ding and C. T. ChanPlasmonic resonances of nanoparticles have drawn lots of attention due to their interesting and useful properties such as strong field enhancements. The self-consistent hydrodynamics model has the advantage that it can incorporate the quantum effect of the electron gas into classical electrodynamics...
2017-09-19T10:00:00+00:00
Author(s): Benjamin Commeau, R. Matthias Geilhufe, Gayanath W. Fernando, and Alexander V. Balatsky${(\mathrm{BEDT}\text{−}\mathrm{TFF})}_{2}{\mathrm{I}}_{3}$ charge transfer salts are reported to show superconductivity and pressure-induced quasi-two-dimensional Dirac cones at the Fermi level. By performing state of the art ab initio calculations in the framework of density functional theory, we ...
2017-09-19T10:00:00+00:00
Author(s): Christopher Reeg, Daniel Loss, and Jelena KlinovajaWe study the proximity effect in a one-dimensional nanowire strongly coupled to a finite superconductor with a characteristic size which is much shorter than its coherence length. Such geometries have become increasingly relevant in recent years in the experimental search for Majorana fermions with ...
2017-09-19T10:00:00+00:00
Author(s): K. A. Makhnovets and A. K. KolezhukWe study the van der Waals interaction of a metallic or narrow-gap semiconducting nanowire with a surface, in the regime of intermediate wire-surface distances $({v}_{F}/c)L≪d≪L$ or $L≪d≪(c/{v}_{F})L$, where $L$ is the nanowire length, $d$ is the distance to the surface, and ${v}_{F}$ is the charact...
2017-09-19T10:00:00+00:00
Author(s): V. Knittel, M. P. Fischer, M. Vennekel, T. Rybka, A. Leitenstorfer, and D. BridaFemtosecond optical pulses tunable in the near infrared are exploited to drive third harmonic generation (THG) and incoherent multiphoton photoluminescence (MPPL) in gold plasmonic nanoantennas. By comparing the yield of the two processes concurrently occurring on the same nanostructure, we extract ...
2017-09-18T10:00:00+00:00
Author(s): Chen-Hsi Huang, Leili Gharaee, Yue Zhao, Paul Erhart, and Jaime MarianHigh-temperature, high-dose, neutron irradiation of W results in the formation of Re-rich clusters at concentrations one order of magnitude lower than the thermodynamic solubility limit. These clusters may eventually transform into brittle W-Re intermetallic phases, which can lead to high levels of ...
2017-09-18T10:00:00+00:00
Author(s): Tian-Sheng Zeng and D. N. ShengMotivated by experimental observations of time-symmetry breaking behavior in a periodically driven (Floquet) system, we study a one-dimensional spin model to explore the stability of such Floquet discrete time crystals (DTCs) under the interplay between interaction and the microwave driving. For int...
2017-09-18T10:00:00+00:00
Author(s): Bingyu Cui, Jie Yang, Jichao Qiao, Minqiang Jiang, Lanhong Dai, Yun-Jiang Wang, and Alessio ZacconeAn atomic-scale theory of the viscoelastic response of metallic glasses is derived from first principles, using a Zwanzig-Caldeira-Leggett system-bath Hamiltonian as a starting point within the framework of nonaffine linear response to mechanical deformation. This approach provides a generalized Lan...
2017-09-18T10:00:00+00:00
Author(s): Bogdan-Ioan PopaAcoustic sensors operating in lossy environments, such as water, require significant sensitivity to overcome the sound attenuation in the environment and thus see farther. We show here that a surprisingly large class of passive fluids has the ability to enhance the sound pressure propagating inside ...
2017-09-18T10:00:00+00:00
Author(s): R. D. Yamaletdinov, V. A. Slipko, and Y. V. PershinKinks and antikinks of the classical ${φ}^{4}$ field model are topological solutions connecting its two distinct ground states. Here we establish an analogy between the excitations of a long graphene nanoribbon buckled in the transverse direction and ${φ}^{4}$ model results. Using molecular dynamics...
2017-09-18T10:00:00+00:00
Author(s): Pui-Wai Ma, S. L. Dudarev, and Jan S. WróbelThe occurrence of bcc-fcc ($α−γ$) and fcc-bcc ($γ−δ$) phase transitions in magnetic iron stems from the interplay between magnetic excitations and lattice vibrations. However, this fact has never been confirmed by a direct dynamic simulation, treating noncollinear magnetic fluctuations and dynamics ...
2017-09-18T10:00:00+00:00
Author(s): Vladyslav Kozii, Jonathan Ruhman, Liang Fu, and Leo RadzihovskyWe study the quantum phase transition between a paramagnetic and ferromagnetic metal in the presence of Rashba spin-orbit coupling in one dimension. Using bosonization, we analyze the transition by means of renormalization group, controlled by an $ɛ$ expansion around the upper critical dimension of ...
2017-09-18T10:00:00+00:00
Author(s): Yu. G. Naidyuk, O. E. Kvitnitskaya, N. V. Gamayunova, D. L. Bashlakov, L. V. Tyutrina, G. Fuchs, R. Hühne, D. A. Chareev, and A. N. VasilievFeSe single crystals have been studied by soft point-contact Andreev reflection spectroscopy. Superconducting gap features in the differential resistance $dV/dI(V)$ of point contacts such as a characteristic Andreev reflection double-minimum structure have been measured versus temperature and magnet...
2017-09-18T10:00:00+00:00
Author(s): D. Valentinis, S. Gariglio, A. Fête, J.-M. Triscone, C. Berthod, and D. van der MarelSuperconductivity develops in bulk doped ${\mathrm{SrTiO}}_{3}$ and at the ${\mathrm{LaAlO}}_{3}$/${\mathrm{SrTiO}}_{3}$ interface with a dome-shaped density dependence of the critical temperature ${T}_{c}$, despite different dimensionalities and geometries. We propose that the ${T}_{c}$ dome of ${\...
2017-09-18T10:00:00+00:00
Author(s): S.-H. Baek, A. Erb, and B. BüchnerWe report a comprehensive $^{139}\mathrm{La}$ and $^{63}\mathrm{Cu}$ nuclear magnetic resonance study on ${\mathrm{La}}_{2−x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ $(0.07≤x≤0.2)$ single crystals. The $^{139}\mathrm{La}$ spin-lattice relaxation rate $^{139}\mathrm{T}_{1}^{−1}$ is drastically influenced...
2017-09-18T10:00:00+00:00
Author(s): B. Grygiel, K. Patucha, and T. A. ZaleskiMotivated by recent experimental progress on measuring various correlation functions in systems of ultracold atoms in optical lattices, we study properties of the Bose-Hubbard model in external synthetic magnetic field to describe transport phenomena in a multiband strongly interacting bosonic syste...
2017-09-18T10:00:00+00:00
Author(s): Felix Lochner, Felix Ahn, Tilmann Hickel, and Ilya EreminWe analyze the electronic properties of the recently discovered stoichiometric superconductor ${\mathrm{CaKFe}}_{4}{\mathrm{As}}_{4}$ by combining an ab initio approach and a projection of the band structure to a low-energy tight-binding Hamiltonian, based on the maximally localized Wannier orbitals...
2017-09-18T10:00:00+00:00
Author(s): Yusei Shimizu, Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Dai Aoki, Yoshiya Homma, Ai Nakamura, and Kazushige MachidaTo address the long-standing question of double phase transitions in the superconducting state of U1−xThxBe13, the authors study the quasiparticle excitations and magnetic response using a monocrystalline sample. The high-resolution heat-capacity and magnetization data demonstrate that the lower-temperature transition is between two superconducting states with different gap symmetries. Quite surprisingly, the C(T,H,ph) data strongly suggest that the superconducting gap is fully open over the Fermi surface in U0.97Th0.03Be13. The present thermodynamic results entirely overturn a widely believed idea that nodal quasiparticle excitations occur in uranium heavy-fermion superconductivity with broken time-reversal-symmetry.[Phys. Rev. B 96, 100505(R)] Published Mon Sep 18, 2017[...]2017-09-18T10:00:00+00:00
Author(s): Daniel F. Urban and Christian ElsässerA density functional theory study of atomic defects and dopants in ternary Z-phase transition-metal nitrides $\mathrm{Cr}M\mathrm{N}$ with $M=\mathrm{V}$, Nb, or Ta is presented. Various defect formation energies of native point defects and of substitutional atoms of other metal elements which are a...
2017-09-18T10:00:00+00:00
Author(s): C. R. Lear, P. Bellon, and R. S. AverbackKinetic Monte Carlo simulations have been performed to investigate the evolution of ordered domains in model alloys under irradiation. The alloys investigated were equiatomic binary alloys on a simple square lattice with first and second nearest-neighbor interactions, chosen so that a $2×2$ ordered ...
2017-09-18T10:00:00+00:00
Author(s): Wenjie Dou and Joseph E. SubotnikFor a molecule moving near a single metal surface at equilibrium, following von Oppen and coworkers [N. Bode, S. V. Kusminskiy, R. Egger, and F. von Oppen, Beilstein J. Nanotechnol. 3, 144 (2012)] and using a nonequilibrium Green's-function (NEGF) approach, we derive a very general form of electroni...
2017-09-18T10:00:00+00:00
Author(s): D. Gambino, D. G. Sangiovanni, B. Alling, and I. A. AbrikosovWe use the color diffusion (CD) algorithm in nonequilibrium (accelerated) ab initio molecular dynamics simulations to determine Ti monovacancy jump frequencies in NaCl-structure titanium nitride (TiN), at temperatures ranging from 2200 to 3000 K. Our results show that the CD method extended beyond t...
2017-09-18T10:00:00+00:00
Author(s): M. P. Prange, L. W. Campbell, and S. KerisitThe thermalization of fast electrons by phonons is studied in CsI, NaI, ${\mathrm{SrI}}_{2}$, and ${\mathrm{YAlO}}_{3}$. This numerical study uses an improvement to a recently developed method based on a density functional perturbation description of the phonon modes that provides a way to go beyond...
2017-09-18T10:00:00+00:00
Author(s): Jacek Gurgul, Ewa Młyńczak, Anna Kozioł-Rachwał, Krzysztof Matlak, Kinga Freindl, Ewa Madej, Nika Spiridis, Tomasz Ślęzak, and Józef KoreckiWe study the magnetic properties of epitaxial double-wedge CoO/Fe bilayers grown on MgO(001). We present a comprehensive set of data derived from the hysteresis loops measured as a function of temperature in a wide range of CoO and Fe thicknesses using Kerr microscopy imaging. We focus on relatively...
2017-09-18T10:00:00+00:00
Author(s): Namrata Pattanayak, Arpan Bhattacharyya, A. K. Nigam, Sang-Wook Cheong, and Ashna BajpaiWe explore remanent magnetization $(μ)$ as a function of time and temperature, in a variety of rhombohedral antiferromagnets (AFMs) which are also weak ferromagnets (WFMs) and piezomagnets (PzMs). These measurements, across samples with length scales ranging from nano to bulk, firmly establish the p...