On the magnetic nature of quantum point contacts

被引：17

作者：

Cornaglia, PS ^{[1
]}

Balseiro, CA

机构：

[1] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

EUROPHYSICS LETTERS | 2004年 / 67卷 / 04期

关键词：

D O I：

10.1209/epl/i2004-10090-0

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present results for a model that describes a quantum point contact. We show how electron-electron correlations, within the unrestricted Hartree-Fock approximation, generate a magnetic moment in the point contact. Having characterized the magnetic structure of the contact, we map the problem onto a simple one-channel model and calculate the temperature dependence of the conductance for different gate voltages. Our results are in good agreement with experimental results obtained in GaAs devices and support the idea of Kondo effect in these systems.

引用

页码：634 / 640

页数：7

共 19 条

[1] LOCALIZED MAGNETIC STATES IN METALS [J].