Weak (anti-)localization in doped Z_2-topological insulator

Details Weak (anti-)localization in doped Z_2-topological insulator Weak (anti-)localization in doped Z_2-topological insulator

2009-07-29

arxiv.org/abs/0907.5051v1

Phys. Rev. B 80, 085119 (2009).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 5 figures

Scientific paper

10.1103/PhysRevB.80.085119

Localization properties of the doped Z_2-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, inter-valley scattering, and the Rashba spin-orbit interaction. The known tendency of graphene to anti-localize in the absence of inter-valley scattering between K and K' points is naturally placed as the massless limit of 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 inter-valley 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 drive the system to weak anti-localization in sharp contrast to the ideal graphene case.

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