Two-Parameter Scaling Law of the Anderson Transition

Details Two-Parameter Scaling Law of the Anderson Transition Two-Parameter Scaling Law of the Anderson Transition

2007-03-03

arxiv.org/abs/cond-mat/0703090v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

It is shown that the Anderson transition (AT) in 3d obeys a two-parameter scaling law, derived from a pair of anisotropic scaling transformations, and corresponding critical exponents and scaling function calculated, using a high-precision numerical finite-size scaling study of the smallest Lyapunov exponent of quasi-1d systems of rectangular cross-section of L times l atoms in the limit of infinite L and l < L, for x=l/L ranging from 1/30 to 1/4. The second parameter is x, and there are two singularities: apart from the two-parameter scaling describing AT for x>0, corrections to scaling due to the irrelevant scaling field diverge when x->0, and the corresponding crossover length scale is also estimated. Furthermore, results suggest that the signatures of the AT in 3d should be present also in 2d strongly localized regime.

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