Numerical simulation of diffusive conductivity in Rashba split two-dimensional gas

Hiroyoshi Itoh, Kohji Yamamoto, Jun Ichiro Inoue, Gerrit E.W. Bauer

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We numerically model the conductivity of a two-dimensional electron gas (2DEG) in the presence of the Rashba spin-orbit (SO) interaction in the diffusive transport regime. We performed simulation using samples which width W and length L are up to 200 and 30 000, respectively, on a tight-binding square lattice. When the system is in the diffusive regime, the quadratic increase of the conductivity with SO interaction strength λSO derived previously by Born approximation is reproduced except for very weak SO interaction. In order to obtain satisfactory agreement between numerical and analytical results, the sample width and length should be much larger than the mean free path ℓ but the length should be shorter than the localization length ξ, e.g. 4ℓ≲W and 10ℓ≲L<ξ. The anomaly at weak SO interaction is also observed in the conductance fluctuation and the localization length, and is attributed to the finite size crossover from symplectic to orthogonal class with decreasing SO interaction. The typical values of the SO interaction characterizing the crossover obtained for ℓ∼48 are λSO∼1.0/W and 0.2/W when we impose open and periodic boundary conditions, respectively.

本文言語English
ページ(範囲)120-125
ページ数6
ジャーナルPhysica E: Low-Dimensional Systems and Nanostructures
30
1-2
DOI
出版ステータスPublished - 2005 12
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 凝縮系物理学

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