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Critical spectral statistics in two-dimensional interacting disordered systems
The effect of Coulomb and short-range interactions on the spectral properties
of two-dimensional disordered systems with two spinless fermions is
investigated by numerical scaling techniques. The size independent universality
of the critical nearest level-spacing distribution allows one to find a
delocalization transition at a critical disorder for any non-zero
value of the interaction strength. At the critical point the spacings
distribution has a small- behavior , and a Poisson-like
decay at large spacings.Comment: 4 two-column pages, 3 eps figures, RevTeX, new results adde