Dynamical nuclear polarization in double quantum dots induced by hyperfine interaction

被引：0
|
作者：
Inarrea, J. [1 ,2 ]
Lopez-Monis, C. [1 ]
Platero, G. [1 ]
MacDonald, A. H. [3 ]
机构：
[1] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain
[2] Univ Carlos III Madrid, Escuela Politecn Super, Madrid, Spain
[3] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 05期
关键词：
spin transport; spin blockade; quantum dots; hyperfine interaction;
D O I：
10.1016/j.physe.2007.08.106
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this work the tunneling current through a weakly coupled DQDs in an external B-DC is analyzed. We propose a model which includes hyperfine interaction. The time evolution for electronic charge occupations and for the nuclei polarizations in each dot is obtained by means of rate equations which are self-consistently solved. We analyze the current in the SB region as a function of BDC and observe hysteretic behavior for magnetic fields corresponding to the crossings between triplet and singlet states. Bistability is also produced for the induced nuclei spin polarizations within each quantum dot. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1189 / 1190
页数：2
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