J. Phys. I France
Volume 5, Numéro 11, November 1995
Page(s) 1487 - 1499
DOI: 10.1051/jp1:1995212
J. Phys. I France 5 (1995) 1487-1499

Enhancement of Persistent Currents by Hubbard Interactions in Disordered 1D Rings: Avoided Level Crossings Interpretation

Michael Kamal1, Ziad H. Musslimani2 and Assa Auerbach2

1  Goldman, Sachs & Co., 85 Broad St., New York, NY 10004, USA
2  Department of physics, Technion-Israel Institute of Technology, Haifa 32000, Israel

(Received 26 January 1995, accepted 2 July 1995)

We study effects of local electron interactions on the persistent current of one dimensional disordered rings. For different realizations of disorder we compute the ensemble average current as a function of Aharonov-Bohm flux to zeroth and first orders in the Hubbard interaction. We find that the persistent current is enhanced by on site interactions. Using an avoided level crossings approach, we derive analytic formulas which explain the numerical results at weak disorder. The same approach also explains the opposite effect (suppression) found for spinless fermion models with intersite interactions.

© Les Editions de Physique 1995

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.