Fock space localization, return probability, and conductance of disordered interacting electrons
Abstract
We numerically simulate the low-energy properties of interacting electrons in a random potential using the Hartree-Fock based exact diagonalization method. In particular, we investigate how the transport properties are influenced by the combined effects of disorder and correlations in the presence of the electron spin. To this end we calculate the participation number of many-particle states in Fock space, the return probability of single-particle excitations, and the Kubo-Greenwood conductance. It turns out that in the strongly localized regime interactions increase the conductance whereas for weak disorder interactions decrease the conductance. In contrast, single-particle excitations in general experience a localizing influence of the interactions.
Cite
@article{arxiv.cond-mat/0105481,
title = {Fock space localization, return probability, and conductance of disordered interacting electrons},
author = {Frank Epperlein and Svetlana Kilina and Michael Schreiber and Sergey Uldanov and Thomas Vojta},
journal= {arXiv preprint arXiv:cond-mat/0105481},
year = {2009}
}
Comments
4 pages, 4 eps figures, Proc. of the Symposium on Wave Propagation and Electronic Structure in Disordered Systems, FORTH, Heraklion, Crete, Greece (June 2000)