The Coulomb glass, a model of interacting localized electrons in a random potential, exhibits a soft gap, the Coulomb gap, in the single-particle density of states (DOS) g({ε},T) close to the chemical potential {μ}. In this paper we investigate the Coulomb gap at finite temperatures T by means of a Monte Carlo method. We find that the Coulomb gap fills with increasing temperature. In contrast to previous results the temperature dependence is, however, much stronger than g({μ},T){~}T^D-1 as predicted analytically. It can be described by power laws with the exponents 1.75±{}0.1 for the two-dimensional model and 2.7±{}0.1 for the three-dimensional model. Nevertheless, the relation g({μ},T){~}g({ε},T=0) with {}{ε}-{μ}{}=kBT seems to be valid, since energy dependence of the DOS at low temperatures has also been found to follow power laws with these exponents.
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Sarvestani et al. (1995) studied this question.