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http://eprints.org/relation/isVersionOf http://eprints.iliauni.edu.ge/id/document/4024 http://eprints.org/relation/isVolatileVersionOf http://eprints.iliauni.edu.ge/id/document/4024 http://eprints.org/relation/issmallThumbnailVersionOf http://eprints.iliauni.edu.ge/id/document/4024 archive 34 disk0/00/00/09/36 2014-02-09 11:57:05 2015-04-03 06:37:01 2014-02-09 11:57:05 article show Stroem Anders Johannesson Henrik Japaridze G.I. gia_japaridze@iliauni.edu.ge pub QC fac_eng public 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. 2010-06-24 published Physical Review Letters 104 25 American Physical Society 256804-1 TRUE