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Extremely imbalanced two-dimensional electron-hole-photon systems
A. Tiene, J. Levinsen, M. M. Parish +3
We investigate the phases of two-dimensional electron-hole systems strongly coupled to a microcavity photon field in the limit of extreme charge imbalance. Using variational wave f…
WSe2/WS2 moiré superlattices: a new Hubbard model simulator
Yanhao Tang, Lizhong Li, Tingxin Li +8
The Hubbard model, first formulated by physicist John Hubbard in the 1960s, is a simple theoretical model of interacting quantum particles in a lattice. The model is thought to cap…
Resonant photovoltaic effect in doped magnetic semiconductors
Pankaj Bhalla, Allan H. MacDonald, Dimitrie Culcer
The rectified non-linear response of a clean undoped semiconductor to an AC electric field includes a well known intrinsic contribution -- the shift current. We show that when Kram…
Electronic structure of carbon nanotubes on graphene substrates
Benedetta Flebus, Allan H. MacDonald
Allotropes of carbon, including one-dimensional carbon nanotubes and two-dimensional graphene sheets, continue to draw attention as promising platforms for probing the physics of e…
Quantum-statistical transport phenomena in memristive computing architectures
Christopher N. Singh, Brian A. Crafton, Mathew P. West +8
The advent of reliable, nanoscale memristive components is promising for next generation compute-in-memory paradigms, however, the intrinsic variability in these devices has preven…
Electronic Structure of Single-Twist Trilayer Graphene
Xiao Li, Fengcheng Wu, Allan H. MacDonald
Small-twist-angle bilayer graphene supports strongly correlated insulating states and superconductivity. Twisted few-layer graphene systems are likely to open up new directions for…
Correlated Insulating States in Twisted Double Bilayer Graphene
G. William Burg, Jihang Zhu, Takashi Taniguchi +3
We present a combined experimental and theoretical study of twisted double bilayer graphene with twist angles between 1° and 1.35°. Consistent with moiré band structure calculation…
Terahertz Faraday and Kerr rotation spectroscopy of BiSb films in high magnetic fields up to 30 Tesla
Xinwei Li, Katsumasa Yoshioka, Ming Xie +16
We report results of terahertz Faraday and Kerr rotation spectroscopy measurements on thin films of , an alloy system that exhibits a semimetal-to-top…
Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
Xiaobo Lu, Petr Stepanov, Wei Yang +10
Superconductivity often occurs close to broken-symmetry parent states and is especially common in doped magnetic insulators. When twisted close to a magic relative orientation angl…
Anomalous Drag in Double Bilayer Graphene Quantum-Hall Superfluids
Ming Xie, Allan H. MacDonald
Semiconductor double-layers in the quantum Hall regime tend to have superfluid exciton condensate ground states when the total filling factor is an odd integer, provided that the L…
Vortex Lattice Structure and Topological Superconductivity in the Quantum Hall Regime
Gaurav Chaudhary, Allan H. MacDonald
Chiral topological superconductors are expected to appear as intermediate states when a quantum anomalous Hall system is proximity coupled to an s-wave superconductor and the magne…
Tunneling and Fluctuating Electron-Hole Cooper Pairs in Double Bilayer Graphene
Dmitry K. Efimkin, G. William Burg, Emanuel Tutuc +1
A strong low-temperature enhancement of the tunneling conductance between graphene bilayers has been reported recently, and interpreted as a signature of equilibrium electron-hole…
Quantum Anomalous Hall Effect through Canted Antiferromagnetism
Xiao Li, Allan H. MacDonald, Hua Chen
Most canted antiferromagnets are also anomalous Hall antiferromagnets (AHE AFMs), i.e. they have an anomalous Hall response and other responses with the same symmetry requirements.…
Magnetoelectric Response of Antiferromagnetic Van der Waals Bilayers
Chao Lei, Bheema Lingam Chittari, Kentaro Nomura +3
We predict that antiferromagnetic bilayers formed from van der Waals (vdW) materials, like bilayer CrI, have a strong magnetoelectric response that can be detected by measuring…
Dynamic axion field in the magnetoelectric antiferromagnet chromia
Junlei Wang, Chao Lei, Allan H Macdonald +1
Chromia is a magnetoelectric insulator whose bulk magnetoelectric susceptibility contains a non-zero pseudoscalar component, like that present in magnetized topological insulators.…
Quantum Parity Hall effect in ABA Graphene
Petr Stepanov, Yafis Barlas, Shi Che +10
The celebrated phenomenon of quantum Hall effect has recently been generalized from transport of conserved charges to that of other approximately conserved state variables, includi…