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

Nanotechnology Reviews

article

Santanu K. Maiti¹ 

[1] School of Chemistry, Tel Aviv University

关键词: persistent current;    electron-electron interaction;    spin-orbit coupling;    mean field approximation;   

DOI  :  10.1515/ntrev-2012-0007

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY