Abstract
We calculate the density of states of interacting electrons in a tight-binding lattice with substitutional disorder. The random potential is not assumed to be small and it is therefore treated in the coherent-potential approximation. We find that the anomalous behavior of the density of states near the Fermi energy (--chemically bondE-E/sub F/chemically bond/sup 1/2/) is still described by the Altshuler-Aronov formula, although that formula was derived in the limit of a homogeneous electron gas with weak impurity scattering. The cancellation of band-structure and strong-scattering effects within our model is explicitly demonstrated. This provides strong evidence for the universality of the Altshuler-Aronov result in disordered metals.
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