【摘 要】
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Spin-polarized current generated by thermal bias across a system composed of a quantum dot (QD) connected to metallic leads is studied in the presence of magnet
【机 构】
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School of Electronic and Information Engineering, University of Electronic Science and Technology of
论文部分内容阅读
Spin-polarized current generated by thermal bias across a system composed of a quantum dot (QD) connected to metallic leads is studied in the presence of magnetic and photon fields.The current of a certain spin orientation vanishes when the dot level is aligned to the lead’s chemical potential,resulting in a 100％ spin-polarized current.The spin-resolved current also changes its sign at the two sides of the zero points.By tuning the system’s parameters,spin-up and spin-down currents with equal strength may flow in opposite directions,which induces a pure spin current without the accompany of charge current.With the help of the thermal bias,both the strength and the direction of the spin-polarized current can be manipulated by tuning either the frequency or the intensity of the photon field,which is beyond the reach of the usual electric bias voltage.
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