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
复制标题
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
复制
发表时间:
2011-09
影响因子:
1.6
通讯作者:
S. Q. shen
中科院分区:
文献类型:
--
作者:
H. Z. Lu;吕嵘;S. Q. shen
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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