Optical injection of ac spin currents in a semiconductor via a quantum interference between exciton states of different spatial symmetry
Optical injection of ac spin currents in a semiconductor via a quantum interference between exciton states of different spatial symmetry
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通过不同空间对称性激子态之间的量子干涉在半导体中光学注入交流自旋电流
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Sipe
中科院分区：
文献类型：
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作者：
I. Rumyantsev;J. Sipe
我们从理论上证明了交流自旋电流是如何被光学注入到半导体中的。该效应基于不同空间对称性的相干激子态之间的量子干涉，1S和2P状态。这些激子是由单光子和双光子吸收产生的。根据相应的光脉冲的极化的选择，可以激发纯自旋电流、电流或圆形自旋极化电荷电流。这种效应可以通过观察发射的太赫兹辐射进行实验研究。
We show theoretically how an ac spin current can be optically injected in a semiconductor. The effect is based on the quantum interference between coherent excitonic states of different spatial symmetry e.g., 1s and 2p states . These excitons are generated by oneand two-photon absorption. Depending on the choice of the polarizations of the corresponding optical pulses, a pure spin current, an electrical current, or a circular spin-polarized charge current can be excited. The effect can be experimentally studied by observing the emitted THz radiation.