Interaction-Induced Enhancement and Oscillations of the Persistent Current
Abstract
Description
The persistent current $I$ in integrable models of multichannel rings with both short- and long-ranged interactions is investigated. $I$ is found to oscillate in sign and increase in magnitude with increasing interaction strength due to interaction-induced correlations in the currents contributed by different channels. For sufficiently strong interactions, the contributions of all channels are found to add constructively, leading to a giant enhancement of $I$. Numerical results confirm that this parity-locking effect is robust with respect to subband mixing due to disorder.
Latex, prerpint of Univ. Fribourg and Ecole Fed. Polytech, submitted to PRL for publication
Latex, prerpint of Univ. Fribourg and Ecole Fed. Polytech, submitted to PRL for publication