What carries Landau quantization in insulating monolayer $\mathrm{WTe_2}$?
This text mentions work from 2024 on. Those parts were partly written without a live literature search and have not been checked by an editor yet.
In plain words
Monolayer $\mathrm{WTe_2}$, an insulator in its interior, shows resistance oscillations starting at a weak magnetic field, as if it contained very mobile particles. What these particles are is unknown.
Precise statement
In gated monolayer $\mathrm{WTe_2}$ near charge neutrality, where the bulk is insulating (a 2D topological insulator, also proposed as an excitonic insulator), resistance oscillates periodically in $1/B$ from an onset of $\sim 5 \times 10^{3}\,\mathrm{G}$ (Wang et al. 2021), and thermopower oscillates with sign changes (2024). Identify the mobile fermions responsible (neutral fermions, excitons, or charged carriers of a hidden Fermi surface) and explain why oscillations appear while the bulk resistance stays large.
What would settle it
Simultaneous thermodynamic (capacitance, magnetization) and transport oscillation measurements versus gate density, with local probes showing whether a Fermi surface of charged carriers is present.
Status in the literature
Unverified note: it names recent work and was partly written without a live literature search; it awaits a check by an editor.
Sign-alternating thermopower oscillations in the insulating state were reported in 2024 (Tang et al., arXiv 2405.09665).
Parent problems
- Special case of How can an insulator without a Fermi surface show quantum oscillations? · open · from revision 1 The parent was revised since revision 1: it now states another question.
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