Annealed disorder, rare regions, and local moments: A novel mechanism for metal-insulator transitions

Details Annealed disorder, rare regions, and local moments: A novel mechanism for metal-insulator transitions Annealed disorder, rare regions, and local moments: A novel mechanism for metal-insulator transitions

1999-10-04

arxiv.org/abs/cond-mat/9910040v2

Phys. Rev. Lett. vol. 84, pp. 5176-5179 (2000)

Physics

Condensed Matter

Statistical Mechanics

4 pp., LaTeX, no figs., final version as published

Scientific paper

10.1103/PhysRevLett.84.5176

Local magnetic moments in disordered sytems can be described in terms of annealed magnetic disorder, in addition to the underlying quenched disorder. It is shown that for noninteracting electron systems at zero temperature, the annealed disorder leads to a new mechanism, and a new universality class, for a metal-insulator transition. The transition is driven by a vanishing of the thermodynamic density susceptibility rather than by localization effects. The critical behavior near two-dimensions is determined, and the underlying physics is discussed.

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