title: Observation of a Helical Luttinger Liquid in InAs/GaSb Quantum Spin Hall Edges.
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.
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Tingxin
authors.initials: T
authors.lastname: Li
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Pengjie
authors.initials: P
authors.lastname: Wang
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Hailong
authors.initials: H
authors.lastname: Fu
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77251-1892, USA.
authors.forename: Lingjie
authors.initials: L
authors.lastname: Du
authors.affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Kate A
authors.initials: KA
authors.lastname: Schreiber
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Mu
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Xiaoxue
authors.initials: X
authors.lastname: Liu
authors.affiliation: Teledyne Scientific and Imaging, Thousand Oaks, California 91603, USA.
authors.forename: Gerard
authors.initials: G
authors.lastname: Sullivan
authors.affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Gábor A
authors.initials: GA
authors.lastname: Csáthy
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Lin
authors.affiliation: International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.|Department of Physics and Astronomy, Rice University, Houston, Texas 77251-1892, USA.|Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors.forename: Rui-Rui
authors.initials: RR
authors.lastname: Du