Variable range hopping in the Coulomb glass

Details Variable range hopping in the Coulomb glass Variable range hopping in the Coulomb glass

2009-09-15

arxiv.org/abs/0909.2791v1

Phys. Rev. B 80, 245214 (2009)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

We use a mean-field (Hartree-like) approach to study the conductance of a strongly localized electron system in two dimensions. We find a crossover between a regime where Coulomb interactions modify the conductance significantly to a regime where they are negligible. We show that under rather general conditions the conduction obeys a scaling relation which we verify using numerical simulations. The use of a Hartree self-consistent approach gives a clear physical picture, and removes the ambiguity of the use of single-particle tunneling density-of-states (DOS) in the calculation of the conductance. Furthermore, the theory contains interaction-induced correlations between the on site energy of the localized states and distances, as well as finite temperature corrections of the DOS.

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