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A Generic Topological Criterion for Flat Bands in Two Dimensions
Alireza Parhizkar, Victor Galitski
We show that the continuum limit of moiré graphene is described by a -dimensional field theory of Dirac fermions coupled to two classical vector fields: a periodic gauge and…
Strained Bilayer Graphene, Emergent Energy Scales, and Moire Gravity
Alireza Parhizkar, Victor Galitski
Twisted bilayer graphene is a rich condensed matter system, which allows one to tune energy scales and electronic correlations. The low-energy physics of the resulting moiré struct…
Drag viscosity of metals and its connection to Coulomb drag
Yunxiang Liao, Victor Galitski
Recent years have seen a surge of interest in studies of hydrodynamic transport in electronic systems. We investigate the electron viscosity of metals and find a new component that…
Electron Induced Massive Dynamics of Magnetic Domain Walls
Hilary M. Hurst, Victor Galitski, Tero T. Heikkilä
We study the dynamics of domain walls (DWs) in a metallic, ferromagnetic nanowire. We develop a Keldysh collective coordinate technique to describe the effect of conduction electro…
Cavity superconductor-polaritons
Andrew A. Allocca, Zachary M. Raines, Jonathan B. Curtis +1
Following the recent success of realizing exciton-polariton condensates in cavities, we examine the hybridization of cavity photons with the closest analog of excitons within a sup…
Observation of perfect Andreev reflection due to Klein paradox in a topological superconducting state
Seunghun Lee, Valentin Stanev, Xiaohang Zhang +11
In 1928, P. Dirac proposed a new wave equation to describe relativistic electrons. Shortly afterwards, O. Klein solved a simple potential step problem for the Dirac equation and st…
Fingerprints of Berry phases in the bulk exciton spectrum of a topological insulator
Andrew A. Allocca, Dmitry K. Efimkin, Victor M. Galitski
We examine excitons formed in the bulk of a topological insulator as the system is tuned via a parameter between topological and trivial insulating phases, arguing that nontrivial…
Magnon-induced non-Markovian friction of a domain wall in a ferromagnet
Se Kwon Kim, Oleg Tchernyshyov, Victor Galitski +1
Motivated by the recent study on the quasiparticle-induced friction of solitons in superfluids, we theoretically study magnon-induced intrinsic friction of a domain wall in a one-d…
Interaction-induced transition in the quantum chaotic dynamics of a disordered metal
S. V. Syzranov, A. V. Gorshkov, V. M. Galitski
We demonstrate that a weakly disordered metal with short-range interactions exhibits a transition in the quantum chaotic dynamics when changing the temperature or the interaction s…
Out-of-time-order correlators in finite open systems
S. V. Syzranov, A. V. Gorshkov, V. Galitski
We study out-of-time order correlators (OTOCs) of the form for a quantum system weakly coupled to a dissipative environment. Su…
Enriched axial anomaly in Weyl materials
Zachary Raines, Victor Galitski
While quantum anomalies are often associated with the breaking of a classical symmetry in the quantum theory, their anomalous contributions to observables remain distinct and well-…
Transport of Dirac electrons in a random magnetic field in topological heterostructures
Hilary M. Hurst, Dmitry K. Efimkin, Victor Galitski
We consider the proximity effect between Dirac states at the surface of a topological insulator and a ferromagnet with easy plane anisotropy, which is described by the \emph{XY}-mo…
Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons
Dmitry K. Efimkin, Victor Galitski
Several recent experiments have reported an anomalous temperature dependence of the Coulomb drag effect in electron-hole bilayers. Motivated by these puzzling data, we study theore…
Repulsive Casimir force between Weyl semimetals
Justin H. Wilson, Andrew A. Allocca, Victor M. Galitski
Weyl semimetals are a class of topological materials that exhibit a bulk Hall effect due to time-reversal symmetry breaking. We show that for the idealized semi-infinite case, the…
Charged skyrmions on the surface of a topological insulator
Hilary M. Hurst, Dmitry K. Efimkin, Jiadong Zang +1
We consider the interplay between magnetic skyrmions in an insulating thin film and the Dirac surface states of a 3D topological insulator (TI), coupled by proximity effect. The ma…
Excitonic and Nematic Instabilities on the Surface of Topological Kondo Insulators
Bitan Roy, Johannes Hofmann, Valentin Stanev +2
We study the effects of strong electron-electron interactions on the surface of cubic topological Kondo insulators (such as samarium hexaboride, SmB). Cubic topological Kondo i…
Resonant Faraday and Kerr effects due to in-gap states on the surface of a topological insulator
Justin H. Wilson, Dmitry K. Efimkin, Victor M. Galitski
When Dirac electrons on the surface of a topological insulator are gapped, the resulting quantum anomalous Hall effect leads to universal magneto-optical Faraday and Kerr effects i…
Surface Theory of a Family of Topological Kondo Insulators
Bitan Roy, Jay D. Sau, Maxim Dzero +1
A low-energy theory for the helical metallic states, residing on the surface of cubic topological Kondo insulators, is derived. Despite our analysis being primarily focused on a pr…
A Strongly-Interacting Dirac Liquid on the Surface of a Topological Kondo Insulator
Dmitry K. Efimkin, Victor Galitski
A topological Kondo insulator (TKI) is a strongly-correlated material, where hybridization between the conduction electrons and localized f-electrons gives rise to a crossover from…
Non-analytic behavior of the Casimir force across a Lifshitz transition in a spin-orbit coupled material
Andrew A. Allocca, Justin H. Wilson, Victor Galitski
We propose the Casimir effect as a general method to observe Lifshitz transitions in electron systems. The concept is demonstrated with a planar spin-orbit coupled semiconductor in…
Topological Floquet Spectrum in Three Dimensions via a Two-Photon Resonance
Netanel H. Lindner, Doron L. Bergman, Gil Refael +1
A recent theoretical work [Nature Phys., 7, 490 (2011)] has demonstrated that external non-equilibrium perturbations may be used to convert a two-dimensional semiconductor, initial…
Splitting of Majorana modes due to intervortex tunneling in a p + ip superconductor
Meng Cheng, Roman M. Lutchyn, Victor Galitski +1
We consider a two-dimensional px+i py superconductor in the presence of multiple vortices, which support zero-energy Majorana fermion states in their cores. Intervortex tunnelings…
Topological Insulators and Metals in Atomic Optical Lattices
Tudor D. Stanescu, Victor Galitski, J. Y. Vaishnav +2
We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal…
A self-consistent theory for graphene transport
Shaffique Adam, E. H. Hwang, Victor Galitski +1
We demonstrate theoretically that most of the observed transport properties of graphene sheets at zero magnetic field can be explained by scattering from charged impurities. We fin…