Spin and orbital effects in a 2D electron gas in a random magnetic field

Details Spin and orbital effects in a 2D electron gas in a random magnetic field Spin and orbital effects in a 2D electron gas in a random magnetic field

2004-06-07

arxiv.org/abs/cond-mat/0406171v1

Phys. Rev. B 70, 195326 (2004).

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages, no figures

Scientific paper

10.1103/PhysRevB.70.195326

Using the method of superbosonization we consider a model of a random magnetic field (RMF) acting on both orbital motion and spin of electrons in two dimensions. The method is based on exact integration over one particle degrees of freedom and reduction of the problem to a functional integral over supermatrices $Q({\bf r},{\bf r^{\prime}})$. We consider a general case when both the direction of the RMF and the g-factor of the Zeeman splitting are arbitrary. Integrating out fast variations of $Q$ we come to a standard collisional unitary non-linear $\sigma$-model. The collision term consists of orbital, spin and effective spin-orbital parts. For a particular problem of a fixed direction of RMF, we show that additional soft excitations identified with spin modes should appear. Considering $\delta $% -correlated weak RMF and putting g=2 we find the transport time $\tau_{tr} $. This time is 2 times smaller than that for spinless particles.

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