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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.

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


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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