Weak localization properties of the doped Z2 topological insulator

Ken Ichiro Imura, Yoshio Kuramoto, Kentaro Nomura

研究成果: Article査読

36 被引用数 (Scopus)


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.

ジャーナルPhysical Review B - Condensed Matter and Materials Physics
出版ステータスPublished - 2009 8 27

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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