1.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- California Institute of TechnologyUS70 papers
- Queen's University BelfastGB69 papers
- Center for Astrophysics Harvard & SmithsonianUS40 papers
- Centre National de la Recherche ScientifiqueFR40 papers
- Jet Propulsion LaboratoryUS35 papers
- Tsinghua UniversityCN35 papers
- University of California, Santa BarbaraUS32 papers
- Princeton UniversityUS31 papers
- University of California, Los AngelesUS30 papers
- University of ChileCL28 papers
- Nanjing UniversityCN25 papers
- Atacama Large Millimeter Submillimeter ArrayCL24 papers
90 papers · 1 filter
Anti-topological crystal and non-Abelian liquid in twisted semiconductor bilayers
Aidan P. Reddy, D. N. Sheng, Ahmed Abouelkomsan +2
We show that electron crystals compete closely with non-Abelian fractional Chern insulators in the half-filled second moiré band of twisted bilayer MoTe. Depending on the twist…
Topological quantum phase transitions driven by a displacement field in the twisted MoTe2 bilayers
Prakash Sharma, Yang Peng, D. N. Sheng
We study twisted bilayer MoTe systems at fractional fillings of the lowest hole band under an applied out-of-plane displacement field. By employing exact diagonalization in fin…
Real-space topological invariant for time-quasiperiodic Majoranas
Zihao Qi, Ilyoun Na, Gil Refael +1
When subjected to quasiperiodic driving protocols, superconducting systems have been found to harbor robust time-quasiperiodic Majorana modes, extending the concept beyond static a…
Quantum anomalous Hall crystal at fractional filling of moiré superlattices
D. N. Sheng, Aidan P. Reddy, Ahmed Abouelkomsan +2
We predict the emergence a state of matter with intertwined ferromagnetism, charge order and topology in fractionally filled moiré superlattice bands. Remarkably, these quantum ano…
Distinct Floquet topological classifications from color-decorated frequency lattices with space-time symmetries
Ilyoun Na, Jack Kemp, Robert-Jan Slager +1
We consider nontrivial topological phases in Floquet systems using unitary loops and stroboscopic evolutions under a static Floquet Hamiltonian in the presence of dynamical s…
Local density of state oscillations in laterally heterostructured topological insulator-semiconductor systems
David J. Alspaugh, D. N. Sheng, Mahmoud M. Asmar
We study local density of state (LDOS) oscillations arising from the scattering of electrons at atomic edge defects in topological insulator (TI) surfaces. To create edge scatterin…
Bismuth antiphase domain wall: A three-dimensional manifestation of the Su-Schrieffer-Heeger model
Jinwoong Kim, Cheng-Yi Huang, Hsin Lin +2
The Su, Schrieffer and Heeger (SSH) model, describing the soliton excitations in polyacetylene due to the formation of antiphase domain walls (DW) from the alternating bond pattern…
Elasto-Dynamical Induced Spin and Charge Pumping in Bulk Heavy Metals
Farzad Mahfouzi, Nicholas Kioussis
Analogous to the Spin-Hall Effect (SHE), {\it ab initio} electronic structure calculations reveal that acoustic phonons can induce charge (spin) current flowing along (normal to) i…
Topological space-time crystal
Yang Peng
We introduce a new class of out-of-equilibrium noninteracting topological phases, the topological space-time crystals. These are time-dependent quantum systems which do not have di…
Long-lived Andreev states as evidence for protected hinge modes in a bismuth nanoring Josephson junction
A. Bernard, Y. Peng, A. Kasumov +9
Second-order topological insulators are characterized by helical, non-spin-degenerate, one-dimensional states running along opposite crystal hinges, with no backscattering. Injecti…
Universal nonadiabatic energy pumping in a quasiperiodically driven extended system
Zihao Qi, Gil Refael, Yang Peng
The paradigm of Floquet engineering of topological states of matter can be generalized into the time-quasiperiodic scenario, where a lower dimensional time-dependent system maps in…
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, ,…
Spin transfer torque in MnGa-based ferrimagnetic tunnel junctions from first principles
Maria Stamenova, Plamen Stamenov, Farzad Mahfouzi +3
We report on first-principles calculations of spin-transfer torque (STT) in epitaxial magnetic tunnel junctions (MTJs) based on ferrimagnetic tetragonal MnGa electrodes, both a…
Three-dimensional quantum Hall effect and magnetothermoelectric properties in Weyl semimetals
R. Ma, D. N. Sheng, L. Sheng
We numerically study the three-dimensional (3D) quantum Hall effect (QHE) and magnetothermoelectric transport of Weyl semimetals in the presence of disorder. We obtain a bulk pictu…
Microscopic Origin of Spin-Orbit Torque in Ferromagnetic Heterostructures: A First Principles Approach
Farzad Mahfouzi, Rahul Mishra, Po-Hao Chang +2
We present an {\it ab initio}-based theoretical framework which elucidates the origin of the spin-orbit torque (SOT) in Normal-Metal(NM)/Ferromagnet(FM) heterostructures. The SOT i…
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…
Thermoelectric response and entropy of fractional quantum Hall systems
D. N. Sheng, Liang Fu
We study thermoelectric transport properties of fractional quantum Hall systems based on exact diagonalization calculation. Based on the relation between thermoelectric response an…
Floquet higher-order topological insulators and superconductors with space-time symmetries
Yang Peng
Floquet higher-order topological insulators and superconductors (HOTI/SCs) with an order-two space-time symmetry or antisymmetry are classified. This is achieved by considering uni…
Termination Dependent Topological Surface States in Nodal Loop Semimetal HfP2
Christopher Sims, M. Mofazzel Hosen, Hugo Aramberri +11
Symmetry plays a major role in all disciplines of physics. Within the field of topological materials there is a great interest in understanding how the mechanics of crystalline and…
Saddle-point von Hove singularity and dual topological insulator state in PtHgSe
Barun Ghosh, Sougata Mardanya, Bahadur Singh +7
Saddle-point van Hove singularities in the topological surface states are interesting because they can provide a new pathway for accessing exotic correlated phenomena in topologica…
Damping and Anti-Damping Phenomena in Metallic Antiferromagnets: An ab-initio Study
Farzad Mahfouzi, Nicholas Kioussis
We report on a first principles study of anti-ferromagnetic resonance (AFMR) phenomena in metallic systems [MnX (X=Ir,Pt,Pd,Rh) and FeRh] under an external electric field. We demon…
Definition of the interlayer interaction type in magnetic multilayers analyzing the shape of the ferromagnetic resonance peaks
O. G. Udalov, A. A. Fraerman, E. S. Demidov
We present theoretical study of ferromagnetic resonance in a system of two coupled magnetic layers. We show that an interaction between the layers leads to the occurrence of the so…
Anisotropy of Neel "orange-peel" coupling in magnetic multilayers
M. A. Kuznetsov, O. G. Udalov, A. A. Fraerman
We calculate the energy of the magnetostatic interaction between two ferromagnetic films with uniform magnetization and correlated interfaces (the "orange-peel" effect). The "orang…
First Principles Study of Angular Dependence of Spin-Orbit Torque in Pt/Co and Pd/Co Bilayers
Farzad Mahfouzi, Nicholas Kioussis
Spin-orbit torque (SOT) induced by spin Hall and interfacial effects in heavy metal(HM)/ferromagnetic(FM) bilayers has recently been employed to switch the magnetization direction…