The phase diagram of the multi-dimensional Anderson localization via analytic determination of Lyapunov exponents

Details The phase diagram of the multi-dimensional Anderson localization via analytic determination of Lyapunov exponents The phase diagram of the multi-dimensional Anderson localization via analytic determination of Lyapunov exponents

2005-01-19

arxiv.org/abs/cond-mat/0501446v1

Eur. Phys. J. B, 42, 529-542 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

17 pages, 5 figures, to appear in Eur. Phys.J.B

Scientific paper

10.1140/epjb/e2005-00011-1

The method proposed by the present authors to deal analytically with the problem of Anderson localization via disorder [J.Phys.: Condens. Matter {\bf 14} (2002) 13777] is generalized for higher spatial dimensions D. In this way the generalized Lyapunov exponents for diagonal correlators of the wave function, $<\psi^2_{n,\mathbf{m}}>$, can be calculated analytically and exactly. This permits to determine the phase diagram of the system. For all dimensions $D > 2$ one finds intervals in the energy and the disorder where extended and localized states coexist: the metal-insulator transition should thus be interpreted as a first-order transition. The qualitative differences permit to group the systems into two classes: low-dimensional systems ($2\leq D \leq 3$), where localized states are always exponentially localized and high-dimensional systems ($D\geq D_c=4$), where states with non-exponential localization are also formed. The value of the upper critical dimension is found to be $D_0=6$ for the Anderson localization problem; this value is also characteristic of a related problem - percolation.

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