Reentrant behaviour and universality in the Anderson transition

Details Reentrant behaviour and universality in the Anderson transition Reentrant behaviour and universality in the Anderson transition

2000-12-18

arxiv.org/abs/cond-mat/0012332v1

Phys. Rev. B 63, 214202 (2001)

Physics

Condensed Matter

Disordered Systems and Neural Networks

RevTeX code for 6 pages, 5 eps figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.63.214202

The three-dimensional Anderson model with a rectangular distribution of site disorder displays two distinct localization-delocalization transitions, against varying disorder intensity, for a relatively narrow range of Fermi energies. Such transitions are studied through the calculation of localization lengths of quasi-- one-dimensional systems by transfer-matrix methods, and their analysis by finite-size scaling techniques. For the transition at higher disorder we find the localization-length exponent $\nu=1.60(5)$ and the limiting scaled localization-length amplitude $\Lambda_0=0.57(1)$, strongly suggesting universality with the transition at the band centre, for which currently accepted values are $\nu=1.57(2)$ and $\Lambda_0=0.576(2)$. For the lower (reentrant) transition, we estimate $\nu=1.55(15)$ and $\Lambda_0=0.55(5)$, still compatible with universality but much less precise, partly owing to significant finite-size corrections.

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