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  • Title: Edge dynamics in a quantum spin Hall state: effects from Rashba spin-orbit interaction.
    Author: Ström A, Johannesson H, Japaridze GI.
    Journal: Phys Rev Lett; 2010 Jun 25; 104(25):256804. PubMed ID: 20867409.
    Abstract:
    We analyze the dynamics of the helical edge modes of a quantum spin Hall state in the presence of a spatially nonuniform 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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