Nearly noninvasive readout and manipulation of spin in double quantum dot using spin bias

Nearly noninvasive readout and manipulation of spin in double quantum dot using spin bias
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使用自旋偏压实现双量子点中自旋的近乎无创读出和操纵

DOI:
10.1140/epjb/e2011-10648-6
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发表时间:
2011-09
影响因子:
1.6
通讯作者:
S. Q. shen
S. Q. shen
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
H. Z. Lu;吕嵘;S. Q. shen

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利用主方程从理论上研究了具有自旋偏置的两个量子点与电极耦合的动力学。这两个点通过交换相互作用耦合在一起。当交换作用远小于铅-点2耦合且点2处于对称自旋偏置时,点1中初始完全极化的电子自旋发生振荡,衰减可忽略不计。同时,流过点2的电荷电流方向与点1的自旋方向同步振荡。这允许反转或几乎无创地读出点1中的自旋,分别通过在振荡的半整数或整数周期的持续时间内打开和关闭交换相互作用。
Dynamics of two quantum dots coupled to electrodes with spin bias is investigated theoretically by means of the master equations. The two dots are coupled via exchange interaction. When the exchange interaction is much smaller than the lead-dot 2 coupling and dot 2 is under a symmetric spin bias, an initially fully polarized electron spin in dot 1 undergoes an oscillation with ignorable attenuation. Meanwhile, the direction of charge current flowing through dot 2 oscillates in the same period as that of the spin in dot 1. This allows to reverse or nearly noninvasively read out the spin in dot 1, by switching on and off the exchange interaction for a duration of half-integer or integer periods of the oscillation, respectively.
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