Gauge field theory approach to spin transport in a 2D electron gas

Details Gauge field theory approach to spin transport in a 2D electron gas Gauge field theory approach to spin transport in a 2D electron gas

2009-10-02

arxiv.org/abs/0910.0486v2

Cond. Matt. Phys. 12 (2009) 707-716

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Invited contribution to Statphys conference, June 2009, Lviv (Ukraine)

Scientific paper

We discuss the Pauli Hamiltonian including the spin-orbit interaction within an U(1) x SU(2) gauge theory interpretation, where the gauge symmetry appears to be broken. This interpretation offers new insight into the problem of spin currents in the condensed matter environment, and can be extended to Rashba and Dresselhaus spin-orbit interactions. We present a few outcomes of the present formulation: i) it automatically leads to zero spin conductivity, in contrast to predictions of Gauge symmetric treatments, ii) a topological quantization condition leading to voltage quantization follows, and iii) spin interferometers can be conceived in which, starting from a arbitrary incoming unpolarized spinor, it is always possible to construct a perfect spin filtering condition.

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