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

Tingxin Li, Pengjie Wang, Hailong Fu, Lingjie Du, Kate A. Schreiber, Xiaoyang Mu, Xiaoxue Liu, Gerard Sullivan, Gábor A. Csáthy, Xi Lin, and Rui-Rui Du
Phys. Rev. Lett. 115, 136804 – Published 25 September 2015
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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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  • Received 16 June 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.136804

© 2015 American Physical Society

Authors & Affiliations

Tingxin Li1,4, Pengjie Wang1,4, Hailong Fu1,4, Lingjie Du2, Kate A. Schreiber3, Xiaoyang Mu1,4, Xiaoxue Liu1,4, Gerard Sullivan5, Gábor A. Csáthy3, Xi Lin1,4, and Rui-Rui Du1,2,4,*

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

  • *rrd@rice.edu

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Issue

Vol. 115, Iss. 13 — 25 September 2015

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