Volume 60, Number 1, October 2002
|Page(s)||120 - 126|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Disorder-induced enhancement of the persistent current for strongly interacting electrons in one-dimensional rings
Institut de Physique et Chimie des Matériaux de Strasbourg,
UMR 7504 (CNRS-ULP) 23 rue du Loess, 67037 Strasbourg Cedex, France
2 Institute for Theoretical Physics, University of California Santa Barbara, CA 93106, USA
3 Institut für Physik, Universität Augsburg - 86135 Augsburg, Germany
Corresponding author: email@example.com
Accepted: 15 July 2002
We show that disorder increases the persistent current of a half-filled one-dimensional Hubbard-Anderson ring at strong interaction. This unexpected effect results from a perturbative expansion starting from the strongly interacting Mott insulator ground state. The analytical result is confirmed and extended by numerical calculations.
PACS: 73.23.Ra – Persistent currents / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EDP Sciences, 2002
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