Interaction-Induced Enhancement and Oscillations of the Persistent Current

Details Interaction-Induced Enhancement and Oscillations of the Persistent Current Interaction-Induced Enhancement and Oscillations of the Persistent Current

1997-01-06

arxiv.org/abs/cond-mat/9701026v1

Phys. Rev. B 56, R4383 (1997)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Latex, prerpint of Univ. Fribourg and Ecole Fed. Polytech, submitted to PRL for publication

Scientific paper

10.1103/PhysRevB.56.R4383

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.

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