Current Correlations in Quantum Spin Hall Insulators

Abstract

We consider a four-terminal setup of a two-dimensional topological insulator (quantum spin Hall insulator) with local tunneling between the upper and lower edges. The edge modes are modeled as helical Luttinger liquids and the electron-electron interactions are taken into account exactly. Using perturbation theory in the tunneling, we derive the cumulant generating function for the inter-edge current. We show that different possible transport channels give rise to different signatures in the current noise and current cross-correlations, which could be exploited in experiments to elucidate the interplay between electron-electron interactions and the helical nature of the edge states.

5 pages, 2 figures

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• Localization of the Helical Edge States in the Absense of External Magnetic Field
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• Tunneling between helical Majorana modes and helical Luttinger liquids
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