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Observation of a Helical Luttinger Liquid in InAs/GaSb Quantum Spin Hall Edges
Tingxin Li1,2, Pengjie Wang1,2, Hailong Fu1,2
1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Abstract:
We report on the observation of a helical Luttinger liquid in the edge of an 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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