The problem of Anderson localization in a strong spin-orbit coupling case is studied by using a gauge invariant matrix model in ε = 4 — d expansion. An infrared stable fixed point is present and this model belongs to the same universal class as a nonlinear σ model. An expression for the critical exponent of conductivity is obtained in the first order of the ε-expansion.
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S. Hikami (1985) studied this question.
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