Transport through a quantum dot subject to spin and charge bias

被引:16
作者
Swirkowicz, R. [1 ]
Barnas, J. [2 ,3 ]
Wilczynski, M. [1 ]
机构
[1] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland
[2] Adam Mickiewicz Univ, Dept Phys, PL-61614 Poznan, Poland
[3] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
关键词
Quantum dot; Spin bias; Kondo effect; Phonon; ANDERSON IMPURITY; KONDO; CONDUCTANCE; MODEL;
D O I
10.1016/j.jmmm.2009.02.125
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Spin and charge transport through a quantum dot coupled to external nonmagnetic leads is analyzed theoretically in terms of the non-equilibrium Green function formalism based on the equation of motion method. The dot is assumed to be subject to spin and charge bias, and the considerations are focused on the Kondo effect in spin and charge transport. It is shown that the differential spin conductance as a function of spin bias reveals a typical zero-bias Kondo anomaly which becomes split when either magnetic field or charge bias are applied. Significantly different behavior is found for mixed charge/spinconductance. The influence of electron-phonon coupling in the dot on tunneling current as well as on both spin and charge conductance is also analyzed. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:2414 / 2420
页数:7
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