Persistent current in a mesoscopic ring coupled with a quantum dot

被引：24

作者：

Ding, GH ^{[1
]}

Dong, B ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200030, Peoples R China

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.67.195327

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the persistent current of a mesoscopic ring with an embedded quantum dot or a side-coupled quantum dot, using the finite-U slave boson mean-field approach suggested by Kotliar and Ruckenstein [Phys. Rev. Lett. 57, 1362 (1986)]. The persistent current shows interesting dependence on the energy of the dot level epsilon(d) as well as the total number of electrons N-e (modulo 4) in the systems. In the mixed valence regime, the persistent current has a maximum value for the embedded quantum dot case, whereas it shows sharp transition between plateaus of diamagnetic and paramagnetic states for the side-coupled quantum dot case. The Kondo effects on the persistent current are also investigated.

引用

页数：7

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