Density of States and Critical Behavior of the Coulomb Glass

Brigitte Surer, Helmut G. Katzgraber, Gergely T. Zimanyi, Brandon A. Allgood, Gianni Blatter

Published 2008-05-29, updated 2009-02-12Version 2

We present zero-temperature simulations for the single-particle density of states of the Coulomb glass. Our results in three dimensions are consistent with the Efros and Shklovskii prediction for the density of states. Finite-temperature Monte Carlo simulations show no sign of a thermodynamic glass transition down to low temperatures, in disagreement with mean-field theory. Furthermore, the random-displacement formulation of the model undergoes a transition into a distorted Wigner crystal for a surprisingly broad range of the disorder strength.