Issue
EPL
Volume 83, Number 3, August 2008
Article Number 37007
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/83/37007
Published online 22 July 2008
EPL, 83 (2008) 37007
DOI: 10.1209/0295-5075/83/37007

Conductance plateau in quantum spin transport through an interacting quantum dot

Y. J. Bao1, N. H. Tong2, Q. F. Sun3 and S. Q. Shen1

1  Department of Physics, and Center of Theoretical and Computational Physics, The University of Hong Kong Hong Kong, China
2  Department of Physics, Renmin University of China - Beijing 100872, China
3  Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100080, China

yjbao@hkusua.hku.hk

received 24 January 2008; accepted in final form 19 June 2008; published August 2008
published online 22 July 2008

Abstract
Quantum spin transport is studied in an interacting quantum dot. It is found that a conductance "plateau" emerges in the non-linear charge conductance by a spin bias in the Kondo regime. The conductance plateau, as a complementary to the Kondo peak, originates from the strong electron correlation and exchange processes in the quantum dot, and can be regarded as one of the characteristics in quantum spin transport.

PACS
72.25.-b - Spin polarized transport.
73.21.La - Quantum dots.
72.15.Qm - Scattering mechanisms and Kondo effect.

© EPLA 2008