771 citations · 6.5k across the 114 of their papers we have counts for
41 papers · 1 filter
Current-Induced Spin Accumulation and Magnetoresistance in Chiral Semimetals
A. A. Burkov, Michael Smith, Alexander Hickey +1
Weyl fermions possess the property of spin-momentum locking: the expectation value of the spin is parallel or antiparallel to the momentum at any given point in the Brillouin zone…
Electron spin coherence on a solid neon surface
Qianfan Chen, Ivar Martin, Liang Jiang +1
A single electron floating on the surface of a condensed noble-gas liquid or solid can act as a spin qubit with ultralong coherence time, thanks to the extraordinary purity of such…
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…
Interplay between topological protected valley and quantum Hall edge transport
Fabian R. Geisenhof, Felix Winterer, Anna M. Seiler +3
An established way of realizing topologically protected states in a two-dimensional electron gas is by applying a perpendicular magnetic field thus creating quantum Hall edge chann…
Floquet vortex states induced by light carrying the orbital angular momentum
Hwanmun Kim, Hossein Dehghani, Iman Ahmadabadi +2
We propose a scheme to create an electronic Floquet vortex state by irradiating a two-dimensional semiconductor with the laser light carrying non-zero orbital angular momentum. We…
majoranas to dynamically engineer Hamiltonians
Ivar Martin, Kartiek Agarwal
We propose and analyze a family of periodic braiding protocols in systems with multiple localized Majorana modes () for the purposes of Hamiltonian engineering.…
Giant anomalous Hall effect in quasi-two-dimensional layered antiferromagnet CoNbS
Giulia Tenasini, Edoardo Martino, Nicolas Ubrig +8
The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quant…
Quantum frequency locking and down-conversion in a driven cavity-qubit system
Frederik Nathan, Gil Refael, Mark S. Rudner +1
We study a periodically driven qubit coupled to a quantized cavity mode. Despite its apparent simplicity, this system supports a rich variety of exotic phenomena, such as topologic…
Optical imprinting of superlattices in two-dimensional materials
Hwanmun Kim, Hossein Dehghani, Hideo Aoki +2
We propose an optical method of shining circularly polarized and spatially periodic laser fields to imprint superlattice structures in two-dimensional electronic systems. By changi…
Half-integer quantized topological response in quasiperiodically driven quantum systems
Philip J. D. Crowley, Ivar Martin, Anushya Chandran
A spin strongly driven by two harmonic incommensurate drives can pump energy from one drive to the other at a quantized average rate, in close analogy with the quantum Hall effect.…
Spin-to-charge conversion in magnetic Weyl semimetals
Steven S. -L. Zhang, Anton A. Burkov, Ivar Martin +1
Weyl semimetals (WSMs) are a newly discovered class of quantum materials which can host a number of exotic bulk transport properties, such as the chiral magnetic effect, negative m…
Quantized frequency-domain polarization of driven phases of matter
Ian Mondragon-Shem, Ivar Martin, A. Alexandradinata +1
Periodically driven quantum systems can realize novel phases of matter that do not exist in static settings. We study signatures of these drive-induced phases on the -dimens…
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…
Topological classification of quasi-periodically driven quantum systems
Philip J. D. Crowley, Ivar Martin, Anushya Chandran
Few level quantum systems driven by incommensurate fundamental frequencies exhibit temporal analogues of non-interacting phenomena in spatial dimensio…
Topological insulators in twisted transition metal dichalcogenide homobilayers
Fengcheng Wu, Timothy Lovorn, Emanuel Tutuc +2
We show that moiré bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in valleys of twisted bilayer…
Topological frequency conversion in strongly driven quantum systems
Ivar Martin, Gil Refael, Bertrand Halperin
When a physical system is subjected to a strong external multi-frequency drive, its dynamics can be conveniently represented in the multi-dimensional Floquet lattice. The number of…
Nematic quantum liquid crystals of bosons in frustrated lattices
Guanyu Zhu, Jens Koch, Ivar Martin
The problem of interacting bosons in frustrated lattices is an intricate one due to the absence of a unique minimum in the single-particle dispersion where macroscopic number of bo…
Polaronic model of Two Level Systems in amorphous solids
Kartiek Agarwal, Ivar Martin, Mikhail D. Lukin +1
While two levels systems (TLSs) are ubiqitous in solid state systems, microscopic understanding of their nature remains an outstanding problem. Conflicting phenomenological models…
Quantum Hall ice
Gia-Wei Chern, Armin Rahmani, Ivar Martin +1
We show that the chiral kagome ice manifold exhibits an anomalous integer quantum Hall effect (IQHE) when coupled to itinerant electrons. Although electron-mediated interactions se…
Majorana fermions in superconducting helical magnets
Ivar Martin, Alberto F. Morpurgo
In a variety of rare-earth based compounds singlet superconductivity coexists with helical magnetism. Here we demonstrate that surfaces of these systems should generically host a f…
Marginal topological properties of graphene: a comparison with topological insulators
Jian Li, Ivar Martin, Markus Buttiker +1
The electronic structures of graphene systems and topological insulators have closely-related features, such as quantized Berry phase and zero-energy edge states. The reason for th…
Marginality of bulk-edge correspondence for single-valley Hamiltonians
Jian Li, Alberto F. Morpurgo, Markus Büttiker +1
We study the correspondence between the non-trivial topological properties associated with the individual valleys of gapped bilayer graphene (BLG), as a prototypical multi-valley s…
Topological origin of subgap conductance in insulating bilayer graphene
Jian Li, Ivar Martin, Markus Buttiker +1
The edges of graphene-based systems possess unusual electronic properties, originating from the non-trivial topological structure associated to the pseudo-spinorial character of th…
Scalar spin chirality and quantum Hall effect on a triangular lattice
Ivar Martin, C. D. Batista
We study the Kondo Lattice and Hubbard models on a triangular lattice for band filling factor 3/4. We show that a simple non-coplanar chiral spin ordering (scalar spin chirality) i…