Pure spin polarized transport based on Rashba spin orbit interaction through the Aharonov Bohm interferometer embodied four-quantum-dot ring
Pure spin polarized transport based on Rashba spin orbit interaction through the Aharonov Bohm interferometer embodied four-quantum-dot ring作者机构：School of Science Shenyang Ligong University Department of Physics Liaoning University
出 版 物：《Chinese Physics B》 (中国物理B（英文版）)
年 卷 期：2013年第22卷第4期
页 面：420-428页
核心收录：
学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学]
基 金：Project supported by the Natural Science Foundation of Liaoning Province, China (Grant No. 201202085) the National Natural Science Foundation of China(Grant No. 11004138) the Excellent Young Scientists Fund of Liaoning Provence, China (Grant No. LJQ2011020) the Young Scientists Fund of Shenyang Ligong University (Grant No. 2011QN-04-11)
主 题：quantum dot ring Rashba spin–orbit interaction spin-polarized transport "bound states in the continuum" phenomena bias voltage Aharonov–Bohm interferometer
摘 要：The spin-polarized linear conductance spectrum and current–voltage characteristics in a four-quantum-dot ring embodied into Aharonov–Bohm （AB） interferometer are investigated theoretically by considering a local Rashba spin–orbit interaction. It shows that the spin-polarized linear conductance and the corresponding spin polarization are each a function of magnetic flux phase at zero bias voltage with a period of 2π, and that Hubbard U cannot influence the electron transport properties in this case. When adjusting appropriately the structural parameter of inter-dot coupling and dot-lead coupling strength, the electronic spin polarization can reach a maximum value. Furthermore, by adjusting the bias voltages applied to the leads, the spin-up and spin-down currents move in opposite directions and pure spin current exists in the configuration space in appropriate situations. Based on the numerical results, such a model can be applied to the design of a spin filter device.
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