Coulomb gap and variable range hopping in a pinned Wigner crystal
Abstract
It is shown that pinning of an electron Wigner crystal by a small concentration of charged impurities creates the finite density of charged localized states near the Fermi level. In the case of residual impurities in the spacer this density of states is related to nonlinear screening of a close acceptor by a Wigner crystal vacancy. On the other hand, intentional doping by a remote layer of donors is a source of a long range potential, which generates dislocations in Wigner crystal. Dislocations in turn create charged localized states near the Fermi level. In both cases Coulomb interaction of localized states leads to the soft Coulomb gap and ES variable range hopping at low enough temperatures.
Cite
@article{arxiv.cond-mat/0310041,
title = {Coulomb gap and variable range hopping in a pinned Wigner crystal},
author = {B. I. Shklovskii},
journal= {arXiv preprint arXiv:cond-mat/0310041},
year = {2009}
}
Comments
To be published in proceedings of 10th conference on hopping and related phenomena in Physica Status Solidi