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 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...

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Published inPhysical review letters Vol. 115; no. 13; p. 136804
Main Authors Li, Tingxin, Wang, Pengjie, Fu, Hailong, Du, Lingjie, Schreiber, Kate A, Mu, Xiaoyang, Liu, Xiaoxue, Sullivan, Gerard, Csáthy, Gábor A, Lin, Xi, Du, Rui-Rui
Format Journal Article
LanguageEnglish
Published United States 25.09.2015
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Summary: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.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.115.136804