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Abstract: A scheme of spin diode is proposed that uses a step-like quantum wire withRashba spin-orbit interaction, connected to two leads with different width. Itis shown that a very large vertical spin-polarized current can be generatedwhen electrons transmit from the narrow lead to the wide lead, however, itvanishes or becomes very weak when the transport direction is reversed. Thisdifference is revealed to arise from the different local density of electronstates of the quantum wire, which is dependent on the direction of bias. Thespin-polarized current in the proposed structure can be generated andmanipulated by purely electric means and with strong a robustness againstdisorder, displaying the feasibility of this structure for a real application.



Autor: Xianbo Xiao, Yuguang Chen

Fuente: https://arxiv.org/



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