Optically controlled spin polarization in a spin transistor

Lü, Hai-Feng; Guo, Yong; Zu, Xiao-Tao; Zhang, Huai-Wu
April 2009
Applied Physics Letters;4/20/2009, Vol. 94 Issue 16, p162109
Academic Journal
The authors investigate the spin-polarized transport through a quantum dot irradiated by continuous circularly polarized light. For the two-terminal dot device, it is shown that sign reversal of current polarization can be modulated for a range of bias voltage. The system thus operates as a rectifier for spin-current polarization. A three-terminal device is proposed to optimize the degree of spin polarization, which can be modulated arbitrarily by polarized optical pumping in the relative large bias voltage and high temperature.


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