# Anomalous Conductance Oscillations in the Hybridization Gap of InAs/GaSb Quantum Wells

## TL;DR

This paper reports on magnetic conductance oscillations in InAs/GaSb quantum wells, revealing unique in-gap oscillation behavior linked to the insulating bulk, challenging existing theories and proposing a new two-band model.

## Contribution

It introduces a novel observation of in-gap conductance oscillations in InAs/GaSb quantum wells and proposes a two-band model to explain their unique properties.

## Key findings

- In-gap oscillation frequency exceeds that near the conduction band edge.
- Oscillations are linked to the insulating bulk, confirmed by antiphase behavior.
- Temperature effects include thermal activation and smearing, not explained by Lifshitz-Kosevich theory.

## Abstract

We observe the magnetic oscillation of electric conductance in the two-dimensional InAs/GaSb quantum spin Hall insulator. Its insulating bulk origin is unambiguously demonstrated by the antiphase oscillations of the conductance and the resistance. Characteristically, the in-gap oscillation frequency is higher than the Shubnikov-de Haas oscillation close to the conduction band edge in the metallic regime. The temperature dependence shows both thermal activation and smearing effects, which cannot be described by the Lifshitz-Kosevich theory. A two-band Bernevig-Hughes-Zhang model with a large quasiparticle self-energy in the insulating regime is proposed to capture the main properties of the in-gap oscillations.

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Source: https://tomesphere.com/paper/1905.03971