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Magnetotransport in mesoscopic rings and cylinders: effects of electron-electron interaction and spin-orbit coupling

Magnetotransport in mesoscopic rings and cylinders: effects of electron-electron interaction and... Abstract We undertake an in-depth analysis of the magnetotransport properties in mesoscopic single-channel rings and multichannel cylinders within a tight-binding (TB) formalism. The main focus of this review is to illustrate how the long-standing anomalies between the calculated and measured current amplitudes carried by a small conducting ring upon the application of a magnetic flux ϕ can be removed. We discuss two different cases. First, we examine the combined effect of second-neighbor hopping integral and Hubbard correlation on the enhancement of persistent current in the presence of disorder. A significant change in current amplitude is observed compared to the traditional nearest-neighbor hopping model, and the current amplitude becomes quite comparable to experimental realizations. In the other case, we verify that in the presence of spin-orbit interaction, a considerable enhancement of persistent current amplitude takes place, and the current amplitude in a disordered ring becomes almost comparable to that of an ordered one. In addition to these, we also present the detailed band structures and some other related issues to get a complete picture of the phenomena at the microscopic level. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nanotechnology Reviews de Gruyter

Magnetotransport in mesoscopic rings and cylinders: effects of electron-electron interaction and spin-orbit coupling

Nanotechnology Reviews , Volume 1 (3) – Jun 1, 2012

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Publisher
de Gruyter
Copyright
Copyright © 2012 by the
ISSN
2191-9089
eISSN
2191-9097
DOI
10.1515/ntrev-2012-0007
Publisher site
See Article on Publisher Site

Abstract

Abstract We undertake an in-depth analysis of the magnetotransport properties in mesoscopic single-channel rings and multichannel cylinders within a tight-binding (TB) formalism. The main focus of this review is to illustrate how the long-standing anomalies between the calculated and measured current amplitudes carried by a small conducting ring upon the application of a magnetic flux ϕ can be removed. We discuss two different cases. First, we examine the combined effect of second-neighbor hopping integral and Hubbard correlation on the enhancement of persistent current in the presence of disorder. A significant change in current amplitude is observed compared to the traditional nearest-neighbor hopping model, and the current amplitude becomes quite comparable to experimental realizations. In the other case, we verify that in the presence of spin-orbit interaction, a considerable enhancement of persistent current amplitude takes place, and the current amplitude in a disordered ring becomes almost comparable to that of an ordered one. In addition to these, we also present the detailed band structures and some other related issues to get a complete picture of the phenomena at the microscopic level.

Journal

Nanotechnology Reviewsde Gruyter

Published: Jun 1, 2012

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