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Results for "A. Yang Shengyuan"
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Geometrical effects in orbital magnetic susceptibilityNov 02 2014Apr 06 2015Within the wave-packet semiclassical approach, the Bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of ... More Intrinsic Magnetoconductivity of Non-magnetic MetalsSep 23 2016We present a comprehensive study of magnetoconductivity for general three-dimensional non-magnetic metals within the Berry-curvature-corrected semiclassical and Boltzmann framework. We find a new contribution, which is intrinsic in the sense that its ... More Theory of Electromotive Force Induced by Domain Wall MotionSep 07 2007Mar 12 2008We formulate a theory on the dynamics of conduction electrons in the presence of moving magnetic textures in ferromagnetic materials. We show that the variation of local magnetization in both space and time gives rise to topological fields, which induce ... More Chirality Hall Effect in Weyl SemimetalsApr 03 2015We generalize a semiclassical theory and use the argument of angular momentum conservation to examine the ballistic transport in lightly-doped Weyl semimetals, taking into account various phase-space Berry curvatures. We predict universal transverse shifts ... More Buckled honeycomb lattice and unconventional magnetic responseSep 06 2014We study the magnetic response of buckled honeycomb-lattice materials. The buckling breaks the sublattice symmetry, enhances the spin-orbit coupling, and allows the tuning of a topological quantum phase transition. As a result, there are two doubly degenerate ... More Transverse Shift in Andreev ReflectionJun 12 2017An incoming electron is reflected back as a hole at a normal-metal-superconductor interface, a process known as Andreev reflection. We predict that there exists a universal transverse shift in this process due to the effect of spin-orbit coupling in the ... More Goos-Hänchen-like shifts at metal/superconductor interfaceMar 26 2018At a normal-metal/superconductor interface, an incident electron from the normal-metal (N) side can be normally reflected as an electron or Andreev reflected as a hole. We show that pronounced lateral shifts along the interface between the incident and ... More Predicted Unusual Magnetoresponse in Type-II Weyl SemimetalsApr 14 2016Aug 19 2016We show several distinct signatures in the magneto-response of type-II Weyl semimetals. The energy tilt tends to squeeze the Landau levels (LLs), and for a type-II Weyl node, there always exists a critical angle between the B-fileld and the tilt, at which ... More Anomalous spatial shifts in interface electronic scatteringJan 02 2019The anomalous spatial shifts at interface scattering, first studied in geometric optics, recently found their counterparts in the electronic context. It was shown that both longitudinal and transverse shifts, analogous to the Goos-Hanchen and Imbert-Fedorov ... More Electron-Magnon Scattering in Anomalous Hall EffectNov 16 2009We study the role played by electron-magnon scattering in the anomalous Hall effect. We find that it has important contributions distinct from other scattering processes like impurities scattering and phonon scattering. As a demonstration, we calculate ... More Theory of I-V Characteristics of Magnetic Josephson JunctionsOct 15 2010We analyze the electrical characteristics of a circuit consisting of a free thin-film magnetic layer and source and drain electrodes that have opposite magnetization orientations along the free magnet's two hard directions. We find that when the circuit's ... More Two-dimensional Spin-Orbit Dirac Point in Monolayer HfGeTeJun 27 2017Oct 12 2017Dirac points in two-dimensional (2D) materials have been a fascinating subject of research, with graphene as the most prominent example. However, the Dirac points in existing 2D materials, including graphene, are vulnerable against spin-orbit coupling ... More Theory of orbital magnetization in disordered systemsJan 17 2012We present a general formula of the orbital magnetization of disordered systems based on the Keldysh Green's function theory in the gauge-covariant Wigner space. In our approach, the gauge invariance of physical quantities is ensured from the very beginning, ... More Singular Effects of Spin-Flip Scattering on Gapped Dirac FermionsNov 17 2010Aug 27 2011We investigate the effects of spin-flip scattering on the Hall transport and spectral properties of gapped Dirac fermions. We find that in the weak scattering regime, the Berry curvature distribution is dramatically compressed in the electronic energy ... More Multivariable Scaling for the Anomalous Hall EffectMar 11 2015We derive a general scaling relation for the anomalous Hall effect in ferromagnetic metals involving multiple competing scattering mechanisms, described by a quadratic hypersurface in the space spanned by the partial resistivities. We also present experimental ... More Valley-Layer Coupling: A New Design Principle for ValleytronicsApr 13 2019We introduce the concept of valley-layer coupling (VLC) in two-dimensional materials, where the low-energy electronic states in the emergent valleys have valley-contrasted layer polarization such that each state is spatially localized on the top or bottom ... More Composite Dirac SemimetalApr 12 2019Weak topological insulators and Dirac semimetals are gapped and nodal phases with distinct topological properties, respectively. Here, we propose a novel topological phase that exhibits features of both and is dubbed composite Dirac semimetal (CDSM). ... More Composite Dirac SemimetalApr 12 2019Apr 16 2019Weak topological insulators and Dirac semimetals are gapped and nodal phases with distinct topological properties, respectively. Here, we propose a novel topological phase that exhibits features of both and is dubbed composite Dirac semimetal (CDSM). ... More Temperature dependence of side-jump spin Hall conductivityNov 08 2018Mar 15 2019In the conventional paradigm of the spin Hall effect, the side-jump contribution to the spin Hall conductivity is independent of the density of disorder, thus remains unchanged in clean samples when the phonon density varies with temperature. To the contrary, ... More Almost ideal nodal-loop semimetal in monoclinic CuTeO$_3$ materialMar 12 2018Jun 28 2018Nodal-loop semimetals are materials in which the conduction and valence bands cross on a one-dimensional loop in the reciprocal space. For the nodal-loop character to manifest in physical properties, it is desired that the loop is close to the Fermi level, ... More Temperature dependence of side-jump spin Hall conductivityNov 08 2018Feb 13 2019In the conventional paradigm of the spin Hall effect, the side-jump contribution to the spin Hall conductivity is independent of the density of disorder, thus remains unchanged in clean samples when the phonon density varies with temperature. To the contrary, ... More Hourglass Dirac Chain Metal in Rhenium DioxideMay 03 2017Nonsymmorphic symmetries, which involve fractional lattice translations in crystalline materials, can generate exotic types of fermionic excitations that are robust against spin-orbit coupling. Here we report on a hourglass-type dispersion in the bulk ... More Weyl-loop half metal in Li$_3$(FeO$_3$)$_2$Nov 13 2018Nodal-line metals and semimetals, as interesting topological states of matter, have been mostly studied in nonmagnetic materials. Here, based on first-principles calculations and symmetry analysis, we predict that fully spin-polarized Weyl loops can be ... More Transverse shift in crossed Andreev reflectionSep 07 2018Nov 30 2018Crossed Andreev reflection (CAR) is an intriguing effect that occurs in a normal-superconductor-normal junction. In CAR, an incoming electron from one terminal is coherently scattered as an outgoing hole into the other terminal. Here, we reveal that there ... More Topological bosonic states on ribbons of honeycomb latticeAug 09 2018The topological properties of hardcore bosons on ribbons of honeycomb lattice are studied using quantum Monte Carlo simulations. We map out a rich phase diagram with the superfluid and insulator phases at various fillings. Particularly, it is revealed ... More Two-dimensional nodal-loop half metal in monolayer MnNMar 12 2019Two-dimensional (2D) materials with nodal-loop band crossing have been attracting great research interest. However, it remains a challenge to find 2D nodal loops that are robust against spin-orbit coupling (SOC) and realized in magnetic states. Here, ... More Nodal surface semimetals: Theory and material realizationDec 28 2017Mar 13 2018We theoretically study the three-dimensional topological semimetals with nodal surfaces protected by crystalline symmetries. Different from the well-known nodal-point and nodal-line semimetals, in these materials, the conduction and valence bands cross ... More Nodal Loop and Nodal Surface States in Ti3Al Family MaterialsMay 04 2018May 09 2018Topological metals and semimetals are new states of matter which attract great interest in current research. Here, based on first-principles calculations and symmetry analysis, we propose that the family of titanium-based compounds Ti3X (X=Al, Ga, Sn, ... More Type-II nodal loops: theory and material realizationMay 05 2017Aug 22 2017Nodal loop appears when two bands, typically one electron-like and one hole-like, are crossing each other linearly along a one-dimensional manifold in the reciprocal space. Here we propose a new type of nodal loop which emerges from crossing between two ... More Hybrid Dirac Semimetal in CaAgBi Materials FamilyJun 13 2017Based on their formation mechanisms, Dirac points in three-dimensional systems can be classified as accidental or essential. The former can be further distinguished into type-I and type-II, depending on whether the Dirac cone spectrum is completely tipped ... More Quadratic contact point semimetal: Theory and material realizationJun 27 2018Sep 20 2018Most electronic properties of metals are determined solely by the low-energy states around the Fermi level, and for topological metals/semimetals, these low-energy states become distinct because of their unusual energy dispersion and emergent pseudospin ... More New fermions on the line in topological symmorphic metalsMay 22 2016Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and ... More Dirac and Weyl Superconductors in Three DimensionsFeb 27 2014We introduce the concept of 3D Dirac (Weyl) superconductors (SC), which have protected bulk four(two)-fold nodal points and surface Andreev arcs at zero energy. We provide a sufficient criterion for realizing them in centrosymmetric SCs with odd-parity ... More Perfect Valley Filter in Topological Domain WallDec 31 2014We propose a realization of perfect valley filters based on the chiral domain-wall channels between a quantum anomalous Hall insulator and a quantum valley Hall insulator. Uniquely, all these channels reside in the same valley and propagate unidirectionally, ... More Electron Spectral Functions of Reconstructed Quantum Hall EdgesApr 30 2004Aug 03 2005During the reconstruction of the edge of a quantum Hall liquid, Coulomb interaction energy is lowered through the change in the structure of the edge. We use theory developed earlier by one of the authors [K. Yang, Phys. Rev. Lett. 91, 036802 (2003)] ... More Spin polarized states in neutron matter at a strong magnetic fieldAug 10 2009Dec 28 2009Spin polarized states in neutron matter at a strong magnetic field are considered in the model with the Skyrme effective interaction (SLy4, SLy7 parametrizations). Analyzing the self-consistent equations at zero temperature, it is shown that a thermodynamically ... More Parton distributions at high xJun 24 1998We extract the ratio of the down (d) and up (u) parton distribution functions (PDF's) from the ratio of NMC deuteron and proton structure function F_2(d)/F_2(p), using corrections for nuclear binding effects in the deuteron, which are extracted from the ... More