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Phys Rev Lett. 2015 Sep 25;115(13):136804. doi: 10.1103/PhysRevLett.115.136804. Epub 2015 Sep 25.

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

Li T1,2, Wang P1,2, Fu H1,2, Du L3, Schreiber KA4, Mu X1,2, Liu X1,2, Sullivan G5, Csáthy GA4, Lin X1,2, Du RR1,3,2.

Author information

1
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
2
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
3
Department of Physics and Astronomy, Rice University, Houston, Texas 77251-1892, USA.
4
Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
5
Teledyne Scientific and Imaging, Thousand Oaks, California 91603, USA.

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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