A semiclassical theory of the Anderson transition

Details A semiclassical theory of the Anderson transition A semiclassical theory of the Anderson transition

2007-09-10

arxiv.org/abs/0709.1292v4

Phys. Rev. Lett. 100, 076404 (2008)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, journal version

Scientific paper

10.1103/PhysRevLett.100.076404

We study analytically the metal-insulator transition in a disordered conductor by combining the self-consistent theory of localization with the one parameter scaling theory. We provide explicit expressions of the critical exponents and the critical disorder as a function of the spatial dimensionality, $d$. The critical exponent $\nu$ controlling the divergence of the localization length at the transition is found to be $\nu = {1 \over 2}+ {1 \over {d-2}}$. This result confirms that the upper critical dimension is infinity. Level statistics are investigated in detail. We show that the two level correlation function decays exponentially and the number variance is linear with a slope which is an increasing function of the spatial dimensionality.

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