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arXiv · 1905.03971

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

Zhongdong Han·Tingxin Li·Long Zhang·Gerard Sullivan·Rui-Rui Du
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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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Zhongdong Han, Tingxin Li, Long Zhang, Gerard Sullivan, Rui-Rui Du. 2019-05-10. Anomalous Conductance Oscillations in the Hybridization Gap of InAs/GaSb Quantum Wells. https://doi.org/10.1103/physrevlett.123.126803

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