Comments on quantum oscillations in two-dimensional insulators induced by graphite gates

TL;DR

This paper critically examines claims of a unified mechanism for quantum oscillations in graphite-gated 2D devices, arguing that the evidence presented by Zhu et al. is insufficient and their conclusions are unreliable.

Contribution

The paper provides a critical analysis of previous claims, highlighting overlooked aspects and questioning the validity of the proposed unified mechanism for QOs in 2D materials.

Findings

Zhu et al.'s evidence is insufficient across all three studied cases.

Critical aspects of the mechanism are ignored in the original claims.

The conclusions of Zhu et al. are deemed unreliable.

Abstract

A recent Letter by Zhu et al [Phys. Rev. Lett. 127, 247702 (2021)] claimed a unified mechanism for quantum oscillations (QOs) in graphite-gated 2D devices based on studies of three cases (WTe2, MoTe$_2$/WSe$_2$ heterobilayers and bilayer graphene (BLG)). We find that not only are the claims of Zhu et al based on insufficient evidence in all three cases but also critical aspects are ignored. Their conclusions are hence unreliable.