Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-07-06
Europhys. Lett. 90, 47004 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures
Scientific paper
A scheme of spin diode is proposed that uses a step-like quantum wire with Rashba spin-orbit interaction, connected to two leads with different width. It is shown that a very large vertical spin-polarized current can be generated when electrons transmit from the narrow lead to the wide lead, however, it vanishes or becomes very weak when the transport direction is reversed. This difference is revealed to arise from the different local density of electron states of the quantum wire, which is dependent on the direction of bias. The spin-polarized current in the proposed structure can be generated and manipulated by purely electric means and with strong a robustness against disorder, displaying the feasibility of this structure for a real application.
Chen Yuguang
Xiao Xianbo
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