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Article overview
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Spin-orbit scattering in quantum diffusion of massive Dirac fermions | | Wen-Yu Shan
; Hai-Zhou Lu
; Shun-Qing Shen
; | | Date: |
22 Mar 2012 | | Abstract: | Effect of spin-orbit scattering on quantum diffusive transport of
two-dimensional massive Dirac fermions is studied by the diagrammatic
technique. The quantum diffusion of massive Dirac fermions can be viewed as a
singlet Cooperon in the massless limit and a triplet Cooperon in the large-mass
limit. The spin-orbit scattering behaves like random magnetic fields only to
the triplet Cooperon, and suppresses the weak localization of Dirac fermions in
the large-mass regime. This behavior suggests an experiment to detect the weak
localization of bulk subbands in topological insulator thin films, in which a
narrowing of the cusp of the negative magnetoconductivity is expected after
doping heavy-element impurities. Finally, a detailed comparison between the
conventional two-dimensional electrons and Dirac fermions is presented for
impurities of orthogonal, symplectic, and unitary symmetries. | | Source: | arXiv, 1203.4880 | | Services: | Forum | Review | PDF | Favorites | |
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