Abstract
We report on the observation of a helical Luttinger liquid in the edge of an 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 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.
- Received 16 June 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.136804
© 2015 American Physical Society