Weak localization properties of the doped Z2 topological insulator

Ken Ichiro Imura, Yoshio Kuramoto, Kentaro Nomura

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Localization properties of the doped Z2 topological insulator are studied by weak localization theory. The disordered Kane-Mele model for graphene is taken as a prototype and analyzed with attention to effects of the topological mass term, intervalley scattering, and the Rashba spin-orbit interaction. The known tendency of graphene to antilocalize in the absence of intervalley scattering between K and K′ points is naturally placed as the massless limit of the Kane-Mele model. The latter is shown to have a unitary behavior even in the absence of magnetic field due to the topological mass term. When intervalley scattering is introduced, the topological mass term leaves the system in the unitary class, whereas the ordinary mass term, which appears if A and B sublattices are inequivalent, turns the system to weak localization. The Rashba spin-orbit interaction in the presence of K- K′ scattering drives the system to weak antilocalization in sharp contrast to the ideal graphene case.

Original languageEnglish
Article number085119
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number8
DOIs
Publication statusPublished - 2009 Aug 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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