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arXiv · 1507.08362

Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges

Tingxin Li·Pengjie Wang·Hailong Fu·Lingjie Du·Kate A. Schreiber·Xiaoyang Mu·Xiaoxue Liu·Gerard Sullivan·Gábor A. Csáthy·Xi Lin·Rui-Rui Du
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Abstract

We report on the observation of a helical Luttinger-liquid in the edge of InAs/GaSb quantum spin Hall insulator, which shows characteristic suppression of conductance at low temperature and low bias voltage. Moreover, the conductance shows power-law behavior as a function of temperature and bias voltage. The results underscore the strong electron-electron interaction effect in transport of InAs/GaSb edge states. Because of the fact that the Fermi velocity of the edge modes is controlled by gates, the Luttinger parameter can be fine tuned. Realization of a tunable Luttinger-liquid offers a one-dimensional model system for future studies of predicted correlation effects.

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Tingxin Li, Pengjie Wang, Hailong Fu, Lingjie Du, Kate A. Schreiber, Xiaoyang Mu, Xiaoxue Liu, Gerard Sullivan, Gábor A. Csáthy, Xi Lin, Rui-Rui Du. 2015-08-25. Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges. https://doi.org/10.1103/physrevlett.115.136804

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