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

doi:10.1088/1674-1056/22/4/047302

Abstract 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 each are 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 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 situation. Based on the numerical results, such a model can be applied to the design of spin filter device.

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

Received: 22 August 2012
Revised: 09 October 2012
Accepted manuscript online:

PACS:	73.23.-b	(Electronic transport in mesoscopic systems)
	73.63.-b	(Electronic transport in nanoscale materials and structures)

Fund: 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), and the Young Scientists Fund of Shenyang Ligong University (Grant No. 2011QN-04-11).

Corresponding Authors: Wu Li-Jun, Han Yu
E-mail: wulijun20070915@163.com; hanyu@lnu.edu.cn

Cite this article:

Wu Li-Jun (吴丽君), Han Yu (韩宇) Pure spin polarized transport based on Rashba spin–orbit interaction through the Aharonov–Bohm interferometer embodied four-quantum-dot ring 2013 Chin. Phys. B 22 047302

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

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