Publications (172)
Helical liquids and Majorana bound states in quantum wires
Yuval Oreg, Gil Refael, Felix von Oppen
We show that the combination of spin-orbit coupling with a Zeeman field or strong interactions may lead to the formation of a helical liquid in single-channel quantum wires. In a h…
A non-perturbative expression for the transmission through a leaky chiral edge mode
Kun W. Kim, Israel Klich, Gil Refael
Chiral edge modes of topological insulators and Hall states exhibit non-trivial behavior of conductance in the presence of impurities or additional channels. We will present a simp…
A thermodynamic measure of the Magneto-electric coupling in the 3D topological insulator
Doron L. Bergman, Gil Refael
We show that the magneto-electric coupling in 3D (strong) topological insulators is related to a second derivative of the bulk magnetization. The formula we derive is the non-linea…
Do the surface Fermi arcs in Weyl semimetals survive disorder?
Justin H. Wilson, J. H. Pixley, David A. Huse +2
We theoretically study the topological robustness of the surface physics induced by Weyl Fermi-arc surface states in the presence of short-ranged quenched disorder and surface-bulk…
A Mott Glass to Superfluid Transition for Random Bosons in Two Dimensions
Shankar Iyer, David Pekker, Gil Refael
We study the zero temperature superfluid-insulator transition for a two-dimensional model of interacting, lattice bosons in the presence of quenched disorder and particle-hole symm…
Disordered topological metals
Julia S. Meyer, Gil Refael
Topological behavior can be masked when disorder is present. A topological insulator, either intrinsic or interaction induced, may turn gapless when sufficiently disordered. Nevert…
Resistance in Superconductors
Bertrand I. Halperin, Gil Refael, Eugene Demler
In this pedagogical review, we discuss how electrical resistance can arise in superconductors. Starting with the idea of the superconducting order parameter as a condensate wave fu…
The theory of parametrically amplified electron-phonon superconductivity
Mehrtash Babadi, Michael Knap, Ivar Martin +2
The ultrafast optical manipulation of ordered phases in strongly correlated materials is a topic of significant theoretical, experimental, and technological interest. Inspired by a…
An interacting adiabatic quantum motor
Anton Bruch, Silvia Viola Kusminskiy, Gil Refael +1
We present a field theoretic treatment of an adiabatic quantum motor. We explicitly discuss a motor termed Thouless motor which is based on a Thouless pump operating in reverse. Wh…
Measurement Induced Chirality II: Diffusion and Disorder
Brian J J Khor, Matthew Wampler, Gil Refael +1
Repeated quantum measurements can generate effective new non-equilibrium dynamics in matter. Here we combine such a measurement driven system with disorder. In particular, we inves…
Boosting Majorana zero modes
Torsten Karzig, Gil Refael, Felix von Oppen
One-dimensional topological superconductors are known to host Majorana zero modes at domain walls terminating the topological phase. Their nonabelian nature allows for processing q…
Driving induced many-body localization
Eyal Bairey, Gil Refael, Netanel H. Lindner
Subjecting a many-body localized system to a time-periodic drive generically leads to delocalization and a transition to ergodic behavior if the drive is sufficiently strong or of…
Superfluid-insulator transition of disordered bosons in one-dimension
Ehud Altman, Yariv Kafri, Anatoli Polkovnikov +1
We study the superfluid-insulator transition in a one dimensional system of interacting bosons, modeled as a disordered Josephson array, using a strong randomness real space renorm…
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…
Superconductor-to-normal transition in finite nanowires
Gil Refael, Eugene Demler, Yuval Oreg
In this paper we discuss the interplay of quantum fluctuations and dissipation in uniform superconducting nanowires. We consider a phenomenological model with superconducting and n…
Bosonic Entanglement and Quantum Sensing from Energy Transfer in two-tone Floquet Systems
Yinan Chen, Andreas Elben, Angel Rubio +1
Quantum-enhanced sensors, which surpass the standard quantum limit (SQL) and approach the fundamental precision limits dictated by quantum mechanics, are finding applications acros…
Cooling by photo-doping Light-induced symmetry breaking in the Hubbard model
Philipp Werner, Martin Eckstein, Markus Müller +1
An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we demonstrate a mechanism based on light-induced evaporative cooling of holes in…
Controlling ligand-mediated exchange interactions in periodically driven magnetic materials
Swati Chaudhary, Alon Ron, David Hsieh +1
A periodic drive could alter the effective exchange interactions in magnetic materials. Here, we explore how exchange pathways affect the effective interactions of periodically dri…
Anderson Localization on the Bethe Lattice using Cages and the Wegner Flow
Samuel Savitz, Changnan Peng, Gil Refael
Anderson localization on tree-like graphs such as the Bethe lattice, Cayley tree, or random regular graphs has attracted attention due to its apparent mathematical tractability, hy…
Criticality and entanglement in random quantum systems
Gil Refael, Joel E. Moore
We review studies of entanglement entropy in systems with quenched randomness, concentrating on universal behavior at strongly random quantum critical points. The disorder-averaged…
Robust Majorana magic gates via measurements
Torsten Karzig, Yuval Oreg, Gil Refael +1
phase gates (magic gates or T-gates) are crucial to augment topological systems based on Majorana zero modes to full quantum universality. We present a scheme based on a com…
Effect of inhomogeneous coupling on superconductivity
Yue Zou, Israel Klich, Gil Refael
We investigate the influence of inhomogeneity in the pairing coupling constant on dirty BCS superconductors, focusing on , the order parameter , and th…
From Dynamical Localization to Bunching in interacting Floquet Systems
Yuval Baum, Evert P. L. van Nieuwenburg, Gil Refael
We show that a quantum many-body system may be controlled by means of Floquet engineering, i.e., their properties may be controlled and manipulated by employing periodic driving. W…
Many-Body Localization in a Quasiperiodic System
Shankar Iyer, Vadim Oganesyan, Gil Refael +1
Recent theoretical and numerical evidence suggests that localization can survive in disordered many-body systems with very high energy density, provided that interactions are suffi…
Optically induced flat bands in twisted bilayer graphene
Or Katz, Gil Refael, Netanel H. Lindner
Twisted Bilayer Graphene at the magic twist angle features flat energy bands, which lead to superconductivity and strong correlation physics. These unique properties are typically…
spin-phonon simulations of Floquet dynamics in spin Mott insulators
Ruairidh Sutcliffe, Kathleen Hart, Gil Refael +1
The dynamics of magnetic moments coupled to phonons is of great interest for understanding spin transport in solids as well as for our ability to control magnetism via tailored pho…
Quantized Acoustoelectric Floquet Effect in Quantum Nanowires
Christopher Yang, Will Hunt, Gil Refael +1
External coherent fields can drive quantum materials into non-equilibrium states, revealing exotic properties that are unattainable under equilibrium conditions -- an approach know…
Enhancing Shift Current via Virtual Multiband Transitions
Sihan Chen, Swati Chaudhary, Gil Refael +1
Finding materials exhibiting substantial shift current holds the potential for designing shift current-based photovoltaics that outperform conventional solar cells. However, the my…
Dynamical Cooper pairing in non-equilibrium electron-phonon systems
Michael Knap, Mehrtash Babadi, Gil Refael +2
We analyze Cooper pairing instabilities in strongly driven electron-phonon systems. The light-induced non-equilibrium state of phonons results in a simultaneous increase of the sup…
Superextensive charging speeds in a correlated quantum charger
Harald Schmid, Felix von Oppen, Gil Refael +1
We define a quantum charger as an interacting quantum system that transfers energy between two drives. The key figure of merit characterizing a charger is its charging power. Remar…
Superfluid-insulator transition in Fermi-Bose mixtures and the orthogonality catastrophe
Gil Refael, Eugene Demler
The superfluid-insulator transition of bosons is strongly modified by the presence of Fermions. Through an imaginary-time path integral approach, we derive the self-consistent mean…
Topological Polaritons
Torsten Karzig, Charles-Edouard Bardyn, Netanel Lindner +1
The interaction between light and matter can give rise to novel topological states. This principle was recently exemplified in Floquet topological insulators, where \emph{classical…
Evidence of Floquet electronic steady states in graphene under continuous-wave mid-infrared irradiation
Yijing Liu, Christopher Yang, Gabriel Gaertner +9
Light-induced phenomena in materials can exhibit exotic behavior that extends beyond equilibrium properties, offering new avenues for understanding and controlling electronic phase…
Chiral Bogoliubons in Nonlinear Bosonic Systems
Charles-Edouard Bardyn, Torsten Karzig, Gil Refael +1
We present a versatile scheme for creating topological Bogoliubov excitations in weakly interacting bosonic systems. Our proposal relies on a background stationary field that consi…
Particle-hole symmetric localization in optical lattices using time modulated random on-site potentials
Yue Zou, Ryan Barnett, Gil Refael
The random hopping models exhibit many fascinating features, such as diverging localization length and density of states as energy approaches the bandcenter, due to its particle-ho…
MBL-mobile: Quantum engine based on many-body localization
Nicole Yunger Halpern, Christopher David White, Sarang Gopalakrishnan +1
Many-body-localized (MBL) systems do not thermalize under their intrinsic dynamics. The athermality of MBL, we propose, can be harnessed for thermodynamic tasks. We illustrate this…
Clausius-Clapeyron Relations For First Order Phase Transitions In Bilayer Quantum Hall Systems
Yue Zou, Gil Refael, Ady Stern +1
A bilayer system of two-dimensional electron gases in a perpendicular magnetic field exhibits rich phenomena. At total filling factor , as one increases the layer sep…
Manipulating Majorana fermions using supercurrents
Alessandro Romito, Jason Alicea, Gil Refael +1
Topological insulator edges and spin-orbit-coupled quantum wires in proximity to s-wave super- conductors can be tuned through a topological quantum phase transition by a Zeeman fi…
Universal Periods in Quantum Hall Droplets
Gregory A. Fiete, Gil Refael, Matthew P. A. Fisher
Using the hierarchy picture of the fractional quantum Hall effect, we study the the ground state periodicity of a finite size quantum Hall droplet in a quantum Hall fluid of a diff…
Impact of Josephson junction array modes on fluxonium readout
Shraddha Singh, Gil Refael, Aashish Clerk +1
Dispersive readout of superconducting qubits is often limited by readout-drive-induced transitions between qubit levels. While there is a growing understanding of such effects in t…
Dynamic Stimulation of Quantum Coherence in Lattice Bosons
Andrew Robertson, Victor M. Galitski, Gil Refael
Thermal fluctuations tend to destroy long-range phase correlations. Consequently, bosons in a lattice will undergo a transition from a phase-coherent superfluid as the temperature…
Exponentially robust non-Clifford gate in a driven-dissipative circuit
Liam O'Brien, Gil Refael, Frederik Nathan
Recent work (Nathan et al, arXiv:2405.05671) proposed an architecture for a dissipatively stabilized GKP qubit, and protocols for protected Clifford gates. Here we propose a protoc…
Internal entropy from heat current
Noam Schiller, Hiromi Ebisu, Gil Refael +1
We demonstrate that the effective internal entropy of quasiparticles within the non-Abelian fractional quantum Hall effect manifests in the heat current through a tunneling barrier…
Vortex as a probe - suggested measurement of the order parameter structure in iron-based superconductors
Eugeniu Plamadeala, T. Pereg-Barnea, Gil Refael
Impurities, inevitably present in all samples, induce elastic transitions between quasiparticle states on the contours of constant energy. These transitions may be seen in Fourier…
Self-similar phase diagram of the Fibonacci-driven quantum Ising model
Harald Schmid, Yang Peng, Gil Refael +1
We study a stroboscopic quantum Ising model with Fibonacci dynamics. Focusing on boundary spin correlation functions in long but finite chains, our simulations as well as analytica…
Stirring by Staring: Measurement Induced Chirality
Matthew Wampler, Brian J. J. Khor, Gil Refael +1
In quantum mechanics, the observer necessarily plays an active role in the dynamics of the system, making it difficult to probe a system without disturbing it. Here, we leverage th…
Shortcuts to nonabelian braiding
Torsten Karzig, Falko Pientka, Gil Refael +1
Topological quantum information processing relies on adiabatic braiding of nonabelian quasiparticles. Performing the braiding operations in finite time introduces transitions out o…
Topological Frequency Conversion in a Driven Dissipative Quantum Cavity
Frederik Nathan, Ivar Martin, Gil Refael
Recent work (PRX 7, 041008) has shown that a spin coupled to two externally supplied circularly-polarized electromagnetic modes can effectuate a topological, quantized transfer of…
Towards measuring Entanglement Entropies in Many Body Systems
Israel Klich, Gil Refael, Alessandro Silva
We explore the relation between entanglement entropy of quantum many body systems and the distribution of corresponding, properly selected, observables. Such a relation is necessar…
Ground-State Degeneracy of Correlated Insulators with Edges
Gil Refael, Hsiu-Hau Lin
Using the topological flux insertion procedure, the ground-state degeneracy of an insulator on a periodic lattice with filling factor was found to be at least -fold. Ap…
Entanglement entropy of the random spin-1 Heisenberg chain
Gil Refael, Joel E. Moore
Random spin chains at quantum critical points exhibit an entanglement entropy between a segment of length L and the rest of the chain that scales as log_2 L with a universal coeffi…
Hardware-efficient quantum error correction via concatenated bosonic qubits
Harald Putterman, Kyungjoo Noh, Connor T. Hann +118
In order to solve problems of practical importance, quantum computers will likely need to incorporate quantum error correction, where a logical qubit is redundantly encoded in many…
Orbital Floquet Engineering of Exchange Interactions in Magnetic Materials
Swati Chaudhary, David Hsieh, Gil Refael
We present a new scheme to control the spin exchange interactions between two magnetic ions by manipulating the orbital degrees of freedom using a periodic drive. We discuss two di…
A geometrical approach to the dynamics of spinor condensates II: Collective modes
Ryan Barnett, Daniel Podolsky, Gil Refael
In this paper we study the linearized dynamics of spinor condensates using the spin-node formalism developed in arXiv:0812.3403. We provide a general method to linearize the equati…
Susceptibility at the Superfluid-Insulator Transition for One-Dimensional Disordered Bosons
Shankar Iyer, David Pekker, Gil Refael
A pair of recent Monte Carlo studies have reported evidence for and against a crossover from weak to strong-disorder criticality in the one-dimensional dirty boson problem. The Mon…
The Effect of Quantum Phase Slip Interactions on the Transport of Thin Superconducting Wires
Dganit Meidan, Yuval Oreg, Gil Refael
We study theoretically the effect of interactions between quantum phase slips in a short superconducting wire beyond the dilute phase slip approximation. In contrast to the smooth…
Unconventional Josephson signatures of Majorana bound states
Liang Jiang, David Pekker, Jason Alicea +3
A junction between two topological superconductors containing a pair of Majorana fermions exhibits a `fractional' Josephson effect, periodic in the superconductors' phase dif…
Sagnac interference in Carbon nanotubes
Waheb Bishara, Gil Refael, Marc Bockrath
The Sagnac interference mode arises when two interfering counterpropogating beams traverse a loop, but with their velocities detuned by a small amount , with …
Electrical manipulation of Majorana fermions in an interdigitated superconductor-ferromagnet device
Shu-Ping Lee, Jason Alicea, Gil Refael
We show that a topological phase supporting Majorana fermions can form in a 2D electron gas (2DEG) adjacent to an interdigitated superconductor-ferromagnet structure. An advantage…
Permutation Symmetric Critical Phases in Disordered Non-Abelian Anyonic Chains
Lukasz Fidkowski, Gil Refael, Han-Hsuan Lin +1
Topological phases supporting non-abelian anyonic excitations have been proposed as candidates for topological quantum computation. In this paper, we study disordered non-abelian a…
Weber blockade theory of magnetoresistance oscillations in superconducting strips
David Pekker, Gil Refael, Paul M. Goldbart
Recent experiments on the conductance of thin, narrow superconducting strips have found periodic fluctuations, as a function of the perpendicular magnetic field, with a period corr…
Investigating superconductor-insulator transition in thin films using drag resistance:Theoretical analysis of a proposed experiment
Yue Zou, Gil Refael, Jongsoo Yoon
The magnetically driven superconductor-insulator transition in amorphous thin films (e.g., InO, Ta) exhibits several mysterious phenomena, such as a putative metallic phase and a h…
Spin Reduction Transition in Spin-3/2 Random Heisenberg Chains
Gil Refael, Stefan Kehrein, Daniel S. Fisher
Random spin-3/2 antiferromagnetic Heisenberg chains are investigated using an asymptotically exact renormalization group. Randomness is found to induce a quantum phase transition b…
Quantum geometry and bounds on dissipation in slowly driven quantum systems
Iliya Esin, Ãtienne Lantagne-Hurtubise, Frederik Nathan +1
We show that energy dissipation in slowly-driven, Markovian quantum systems at low temperature is linked to the geometry of the driving protocol through the quantum (or Fubini-Stud…
Phase transition of one dimensional bosons with strong disorder
Ehud Altman, Yariv Kafri, Anatoli Polkovnikov +1
We study one dimensional disordered bosons at large commensurate filling. Using a real space renormalization group approach we find a new random fixed point which controls a phase…
Photocurrent Response of Topological Insulator Surface States
Alexandra Junck, Gil Refael, Felix von Oppen
We study the photocurrent response of topological insulator surface states to circularly polarized light for arbitrary oblique incidence. We describe the surface states within a Di…
Transverse Meissner Physics of Planar Superconductors with Columnar Pins
Gil Refael, Walter Hofstetter, David R. Nelson
The statistical mechanics of thermally excited vortex lines with columnar defects can be mapped onto the physics of interacting quantum particles with quenched random disorder in o…
Setting Boundaries with Memory: Generation of Topological Boundary States in Floquet-Induced Synthetic Crystals
Yuval Baum, Gil Refael
When a d-dimensional quantum system is subjected to a periodic drive, it may be treated as a (d+1)-dimensional system, where the extra dimension is a synthetic one. In this work, w…
Non-Abelian statistics and topological quantum information processing in 1D wire networks
Jason Alicea, Yuval Oreg, Gil Refael +2
Topological quantum computation provides an elegant way around decoherence, as one encodes quantum information in a non-local fashion that the environment finds difficult to corrup…
Learning phase transitions from dynamics
Evert van Nieuwenburg, Eyal Bairey, Gil Refael
We propose the use of recurrent neural networks for classifying phases of matter based on the dynamics of experimentally accessible observables. We demonstrate this approach by tra…
Stable Unitary Integrators for the Numerical Implementation of Continuous Unitary Transformations
Samuel Savitz, Gil Refael
The technique of continuous unitary transformations has recently been used to provide physical insight into a diverse array of quantum mechanical systems. However, the question of…
Time-quasiperiodic topological superconductors with Majorana Multiplexing
Yang Peng, Gil Refael
Time-quasiperiodic Majoranas are generalizations of Floquet Majoranas in time-quasiperiodic superconducting systems. We show that in a system driven at mutually irrational freq…
Topologically protected braiding in a single wire using Floquet Majorana modes
Bela Bauer, T. Pereg-Barnea, Torsten Karzig +4
Majorana zero modes are a promising platform for topologically protected quantum information processing. Their non-Abelian nature, which is key for performing quantum gates, is mos…
Lighting up topological insulators: large surface photocurrents from magnetic superlattices
Netanel H. Lindner, Aaron Farrell, Eran Lustig +2
The gapless surface states of topological insulators (TI) can potentially be used to detect and harvest low-frequency infrared light. Nonetheless, it was shown that significant sur…
Topological frequency conversion in Weyl semimetals
Frederik Nathan, Ivar Martin, Gil Refael
We theoretically predict a new working principle for optical amplification, based on Weyl semimetals: when a Weyl semimetal is suitably irradiated at two frequencies, electrons clo…
Self-correcting GKP qubit and gates in a driven-dissipative circuit
Frederik Nathan, Liam O'Brien, Kyungjoo Noh +4
We show that a self-correcting GKP qubit can be realized with a high-impedance LC circuit coupled to a resistor and a Josephson junction via a controllable switch. When activating…
Variational-Correlations Approach to Quantum Many-body Problems
Arbel Haim, Richard Kueng, Gil Refael
We investigate an approach for studying the ground state of a quantum many-body Hamiltonian that is based on treating the correlation functions as variational parameters. In this a…
Ascendance of Superconductivity in Magic-Angle Graphene Multilayers
Yiran Zhang, Robert Polski, Cyprian Lewandowski +10
Graphene moire superlattices have emerged as a platform hosting and abundance of correlated insulating, topological, and superconducting phases. While the origins of strong correla…
Adiabatic quantum motors
Raul Bustos-Marun, Gil Refael, Felix von Oppen
When parameters are varied periodically, charge can be pumped through a mesoscopic conductor without applied bias. Here, we consider the inverse effect in which a transport current…
Topological Polaritons and Excitons in Garden Variety Systems
Charles-Edouard Bardyn, Torsten Karzig, Gil Refael +1
Topological polaritons (aka topolaritons) present a new frontier for topological behavior in solid-state systems. They combine light and matter, which allows to probe and manipulat…
Topological energy conversion through bulk or boundary of driven systems
Yang Peng, Gil Refael
Combining physical and synthetic dimensions allows a controllable realization and manipulation of high dimensional topological states. In our work, we introduce two quasiperiodical…
Universal transport in periodically driven systems without long-lived quasiparticles
Iliya Esin, Clemens Kuhlenkamp, Gil Refael +3
An intriguing regime of universal charge transport at high entropy density has been proposed for periodically driven interacting one-dimensional systems with Bloch bands separated…
Disorder-induced Floquet Topological Insulators
Paraj Titum, Netanel H. Lindner, Mikael C. Rechtsman +1
We investigate the possibility of realizing a disorder-induced topological Floquet spectrum in two-dimensional periodically-driven systems. Such a state would be a dynamical realiz…
Building a fault-tolerant quantum computer using concatenated cat codes
Christopher Chamberland, Kyungjoo Noh, Patricio Arrangoiz-Arriola +13
We present a comprehensive architectural analysis for a proposed fault-tolerant quantum computer based on cat codes concatenated with outer quantum error-correcting codes. For the…
Strong disorder renormalization group primer and the superfluid-insulator transition
Gil Refael, Ehud Altman
This brief review introduces the method and application of real-space renormalization group to strongly disordered quantum systems. The focus is on recent applications of the stron…
Fixed points of Wegner-Wilson flows and many-body localization
David Pekker, Bryan K. Clark, Vadim Oganesyan +1
Many-body localization (MBL) is a phase of matter that is characterized by the absence of thermalization. Dynamical generation of a large number of local quantum numbers has been i…
Simulation results for an interacting pair of resistively shunted Josephson junctions
Philipp Werner, Gil Refael, Matthias Troyer
Using a new cluster Monte Carlo algorithm, we study the phase diagram and critical properties of an interacting pair of resistively shunted Josephson junctions. This system models…
Transport through a disordered topological-metal strip
Alexandra Junck, Kun W. Kim, Doron L. Bergman +2
Features of a topological phase, and edge states in particular, may be obscured by overlapping in energy with a trivial conduction band. The topological nature of such a conductor,…
Self-organized Floquet band geometry in cavity-driven quantum materials
Christopher Yang, Gil Refael, Mark S. Rudner +1
Floquet engineering has emerged as a powerful route to dynamically control band structure and topology in quantum materials, but most implementations rely on externally imposed las…
Imaging Electronic Correlations in Twisted Bilayer Graphene near the Magic Angle
Youngjoon Choi, Jeannette Kemmer, Yang Peng +11
Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a strongly correlated electronic platform. Here, we use scan…
Hierarchy of Symmetry Breaking Correlated Phases in Twisted Bilayer Graphene
Robert Polski, Yiran Zhang, Yang Peng +8
Twisted bilayer graphene (TBG) near the magic twist angle of exhibits a rich phase diagram. However, the interplay between different phases and their dependence on tw…
Floquet Majorana bound states in voltage-biased Planar Josephson Junctions
Changnan Peng, Arbel Haim, Torsten Karzig +2
We study a planar Josephson junction under an applied DC voltage bias in the presence of an in-plane magnetic field. Upon tuning the bias voltage across the junction, ,…
Sagnac interference in Carbon nanotube loops
Gil Refael, Jinseong Heo, Marc Bockrath
In this paper we study electron interference in nanotube loops. The conductance as a function of the applied voltage is shown to oscillate due to interference between electron beam…
Topological Polaritons in a Quantum Spin Hall Cavity
Alexander Janot, Bernd Rosenow, Gil Refael
We study the topological structure of matter-light excitations, so called polaritons, in a quantum spin Hall insulator coupled to photonic cavity modes. We identify a topological i…
Anomalous exciton transport in response to a uniform, in-plane electric field
Swati Chaudhary, Christina Knapp, Gil Refael
Excitons are neutral objects, that, naively, should have no response to a uniform, electric field. Could the Berry curvature of the underlying electronic bands alter this conclusio…
Berry-electrodynamics - Anomalous drift and pumping from time-dependent Berry connection
Swati Chaudhary, Manuel Endres, Gil Refael
The Berry curvature of a Bloch band can be interpreted as a local magnetic field in reciprocal space. This analogy can be extended by defining an electric field analog in reciproca…
Magneto-Josephson effects in junctions with Majorana bound states
Liang Jiang, David Pekker, Jason Alicea +4
We investigate 1D quantum systems that support Majorana bound states at interfaces between topologically distinct regions. In particular, we show that there exists a duality betwee…
Energy Correlations In Random Transverse Field Ising Spin Chains
Gil Refael, Daniel S. Fisher
The end-to-end energy - energy correlations of random transverse-field quantum Ising spin chains are computed using a generalization of an asymptotically exact real-space renormali…
Photocurrents in Weyl semimetals
Ching-Kit Chan, Netanel H. Lindner, Gil Refael +1
The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry-forbidden. In sharp contrast, we show that three-dimensional Weyl semimetals can generically s…
Phonon-induced Floquet second-order topological phases protected by space-time symmetries
Swati Chaudhary, Arbel Haim, Yang Peng +1
The co-existence of spatial and non-spatial symmetries together with appropriate commutation/anticommutation relations between them can give rise to static higher-order topological…