Anisotropic conductivity of disordered 2DEGs due to spin-orbit interactions

Details Anisotropic conductivity of disordered 2DEGs due to spin-orbit interactions Anisotropic conductivity of disordered 2DEGs due to spin-orbit interactions

2007-08-27

arxiv.org/abs/0708.3504v2

Phys. Rev. B v. 77 p.115352 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6+ pages

Scientific paper

10.1103/PhysRevB.77.115352

We show that the conductivity tensor of a disordered two-dimensional electron gas becomes anisotropic in the presence of both Rashba and Dresselhaus spin-orbit interactions (SOI). This anisotropy is a mesoscopic effect and vanishes with vanishing charge dephasing time. Using a diagrammatic approach including zero, one, and two-loop diagrams, we show that a consistent calculation needs to go beyond a Boltzmann equation approach. In the absence of charge dephasing and for zero frequency, a finite anisotropy \sigma_{xy} e^2/lhpf arises even for infinitesimal SOI.

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