A Hartree-Fock Study of Persistent Currents in Disordered Rings
Abstract
For a system of spinless fermions in a disordered mesoscopic ring, interactions can give rise to an enhancement of the persistent current by orders of magnitude. The increase in the current is associated with a charge reorganization of the ground state. The interaction strength for which this reorganization takes place is sample-dependent and the log-averages over the ensemble are not representative. In this paper we demonstrate that the Hartree-Fock method closely reproduces results obtained by exact diagonalization. For spinless fermions subject to a short-range Coulomb repulsion U we show that due to charge reorganization the derivative of the persistent current is a discontinuous function of U. Having established that the Hartree-Fock method works well in one dimension, we present corresponding results for persistent currents in two coupled chains.
Keywords
Cite
@article{arxiv.cond-mat/9901343,
title = {A Hartree-Fock Study of Persistent Currents in Disordered Rings},
author = {A. Kambili and C. J. Lambert and J. H. Jefferson},
journal= {arXiv preprint arXiv:cond-mat/9901343},
year = {2009}
}
Comments
4 pages, 6 figures, Submitted to Phys. Rev. B