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

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.

preprint2015arXivOpen access
Tingxin LiPengjie WangHailong FuLingjie DuKate A. SchreiberXiaoyang MuXiaoxue LiuGerard SullivanGábor A. CsáthyXi LinRui-Rui Du
cond-mat.mes-hall
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Open access11 authors1 topic
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Tingxin LiPengjie WangHailong FuLingjie DuKate A. SchreiberXiaoyang MuXiaoxue LiuGerard SullivanGábor A. CsáthyXi LinRui-Rui Du

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