Pure spin polarized transport based on Rashba spin orbit interaction through the Aharonov Bohm interferometer embodied four-quantum-dot ring  

作　　者：吴丽君 韩宇 

机构地区：[1]School of Science, Shenyang Ligong University [2]Department of Physics, Liaoning University

出　　处：《Chinese Physics B》2013年第4期420-428,共9页中国物理B（英文版）

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)

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.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.

关 键 词：quantum dot ring Rashba spin–orbit interaction spin-polarized transport ＂bound states in the continuum＂ phenomena bias voltage Aharonov–Bohm interferometer 

分 类 号：O413[理学—理论物理]