Fluctuations of the Energy Levels Number at the Mobility Edge
Arkadii G. Aronov, Alexander D. Mirlin
Abstract
We present a detailed analysis of the behavior of two--level correlation function R(s) in the disordered sample. We show that in the vicinity of the Anderson transition as well as in 2d, the variance of the number of levels in an energy band of a width E has a linear behavior as a function of E. This is related with an ``anomalous'' contribution to the sum rule for R(s), which comes from the ``ballistic'' region of s.
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