Large nuclear overhauser fields detected in vertically coupled double quantum dots
Large nuclear overhauser fields detected in vertically coupled double quantum dots
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DOI：
10.1103/physrevlett.99.096804
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发表时间：
2007-08-31
影响因子：
8.6
通讯作者：
Tarucha, Seigo
中科院分区：
文献类型：
--
作者：
Baugh, Jonathan;Kitamura, Yosuke;Tarucha, Seigo
本文报道了双GaAs垂直量子点在自旋封锁区的电感应和动态核极化的探测。核Overhauser场测量依赖于点间自旋交换耦合的偏置电压控制和在可变外磁场下的直流电流测量。观察到的最大Overhauser场约为4 T，对应于这些装置典型的电子g因子的约40%的核极化，|g（*）|约为0.25。提出了一个唯象模型来解释这些现象。
We report the electrical induction and detection of dynamic nuclear polarization in the spin-blockade regime of double GaAs vertical quantum dots. The nuclear Overhauser field measurement relies on bias voltage control of the interdot spin exchange coupling and measurement of dc current at variable external magnetic fields. The largest Overhauser field observed was about 4 T, corresponding to a nuclear polarization approximate to 40% for the electronic g factor typical of these devices, |g(*)|approximate to 0.25. A phenomenological model is proposed to explain these observations.