Quantum oscillations in the activated conductivity in excitonic insulators: possible application to monolayer WTe2

Abstract

A recent paper on the insulating state of monolayer WTe2 reported the observation of large oscillations in the conductivity that are periodic in 1/B, resembling quantum oscillations in metals. This remarkable observation has inspired suggestions of exotic physics such as spin-charge separation. We show that a rather more conventional but still nontrivial explanation in terms of gap modulation may be possible in a model of excitonic insulator subject to a magnetic field.

References in corpus (2)

• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Excitons in topological Kondo insulators - theory of thermodynamic and transport anomalies in SmB${}_6$

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• $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB${}_{12}$
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• Theory of Difference Frequency Quantum Oscillations
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• The Detection of Unconventional Quantum Oscillations in Insulating 2D Materials
• Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
• A Mean-Field Study of Quantum Oscillations in Two-Dimensional Kondo Insulators
• Magnetic-field effect on excitonic condensation emergent in extended Falicov-Kimball model