Asymptotics of Universal Probability of Neighboring Level Spacings at the Anderson Transition

Abstract

The nearest-neighbor level spacing distribution is numerically investigated by directly diagonalizing disordered Anderson Hamiltonians for systems of sizes up to 100 x 100 x 100 lattice sites. The scaling behavior of the level statistics is examined for large spacings near the delocalization-localization transition and the correlation length exponent is found. By using high-precision calculations we conjecture a new interpolation of the critical cumulative probability, which has size-independent asymptotic form \ln I(s) \propto -s^α with α= 1.0 \pm 0.1.

5 pages, RevTex, 4 figures, to appear in Physical Review Letters

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