Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit Interaction

Details Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit Interaction Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit Interaction

2010-04-16

arxiv.org/abs/1004.2777v2

Phys. Rev. Lett. 104, 256804 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures; published version

Scientific paper

10.1103/PhysRevLett.104.256804

We analyze the dynamics of the helical edge modes of a quantum spin Hall state in the presence of a spatially non-uniform Rashba spin-orbit (SO) interaction. A randomly fluctuating Rashba SO coupling is found to open a scattering channel which causes localization of the edge modes for a weakly screened electron-electron (e-e) interaction. A periodic modulation of the SO coupling, with a wave number commensurate with the Fermi momentum, makes the edge insulating already at intermediate strengths of the e-e interaction. We discuss implications for experiments on edge state transport in a HgTe quantum well.

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