Kondo Impurity in a Mesoscopic Ring: Charge Persistent Current

被引：0

作者：

H.-P. Eeckle

H. Johannesson

C. A. Stafford

机构：

[1] University of Jyväskylä,Department of Physics

[2] University of Arizona,Department of Physics

[3] Chalmers University of Technology and Göteborg University,Institute of Theoretical Physics

[4] Albert-Ludwigs-Universität,Fakultät für Physik

来源：

Journal of Low Temperature Physics | 2000年 / 118卷

关键词：

Magnetic Material; Exchange Interaction; Free Electron; Twist Angle; Magnetic Impurity;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We study the influence of a magnetic impurity or ultrasmallquantum dot on the charge persistent current of a mesoscopicring. The system consists of electrons in a one-dimensionalring threaded by spin-dependent Aharonov–Bohm/Casher fluxes,coupled via an antiferromagnetic exchange interaction to alocalized electron. By passing to a basis of electron stateswith definite parities, the problem is mapped onto a Kondomodel for the even-parity channel plus free electrons in theodd-parity channel. The twisted boundary conditionsrepresenting the fluxes couple states of opposite parityunless the twist angles satisfy φα=fαπ,where fα are integers, with spin indexα=↑, ↓. For these special values ofφα, the model is solved exactly by a Bethe ansatz.Special cases are investigated in detail. In particular weshow that the charge stiffness in the caseφ↑=φ↓ is insensitive to the presenceof the magnetic impurity/quantum dot.

引用

页码：475 / 483

页数：8

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