Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device

doi:10.1088/1674-1056/22/5/057306

中国物理B ›› 2013, Vol. 22 ›› Issue (5): 57306-057306.doi: 10.1088/1674-1056/22/5/057306

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device

洪学鹍, 杨希峰, 冯金福, 刘玉申

Laboratory of Advanced Functional Materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500, China

收稿日期:2012-10-17 修回日期:2012-11-26 出版日期:2013-04-01 发布日期:2013-04-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11247028, 11147162, and 61106126) and the Open Fund of Jiangsu Laboratory of Advanced Functional Materials, China (Grant No. 12KFJJ001).

Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device

Hong Xue-Kun (洪学鹍), Yang Xi-Feng (杨希峰), Feng Jin-Fu (冯金福), Liu Yu-Shen (刘玉申)

Laboratory of Advanced Functional Materials and College of Physics and Engineering, Changshu Institute of Technology, Changshu 215500, China

Received:2012-10-17 Revised:2012-11-26 Online:2013-04-01 Published:2013-04-01
Contact: Liu Yu-Shen E-mail:ysliu@cslg.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11247028, 11147162, and 61106126) and the Open Fund of Jiangsu Laboratory of Advanced Functional Materials, China (Grant No. 12KFJJ001).

摘要/Abstract

摘要： We propose a Rashba three-terminal double-quantum-dot device to generate a spin-polarized current and manipulate the electron spin in each quantum dot by utilizing the temperature gradient instead of the electric bias voltage. This device possesses a nonresonant tunneling channel and two resonant tunneling channels. The Keldysh nonequilibrium Green's function techniques are employed to determinate the spin-polarized current flowing from the electrodes and the spin accumulation in each quantum dot. We find that their signs and magnitudes are well controllable by the gate voltage or the temperature gradient. This result is attribute to the change in the slope of the transmission probability at the Fermi levels in the low-temperature region. Importantly, an obviously pure spin current can be injected into or extracted from one of the three electrodes by properly choosing the temperature gradient and the gate voltages. Therefore, the device can be used as an ideal thermal generator to produce a pure spin current and manipulate the electron spin in the quantum dot.

关键词: Rashba quantum dot, spin polarization, spin accumulation, temperature gradient

Abstract: We propose a Rashba three-terminal double-quantum-dot device to generate a spin-polarized current and manipulate the electron spin in each quantum dot by utilizing the temperature gradient instead of the electric bias voltage. This device possesses a nonresonant tunneling channel and two resonant tunneling channels. The Keldysh nonequilibrium Green's function techniques are employed to determinate the spin-polarized current flowing from the electrodes and the spin accumulation in each quantum dot. We find that their signs and magnitudes are well controllable by the gate voltage or the temperature gradient. This result is attribute to the change in the slope of the transmission probability at the Fermi levels in the low-temperature region. Importantly, an obviously pure spin current can be injected into or extracted from one of the three electrodes by properly choosing the temperature gradient and the gate voltages. Therefore, the device can be used as an ideal thermal generator to produce a pure spin current and manipulate the electron spin in the quantum dot.

Key words: Rashba quantum dot, spin polarization, spin accumulation, temperature gradient

中图分类号: (Quantum dots)

73.63.Kv

71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 72.20.Pa (Thermoelectric and thermomagnetic effects)

洪学鹍, 杨希峰, 冯金福, 刘玉申. Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device[J]. 中国物理B, 2013, 22(5): 57306-057306.

Hong Xue-Kun (洪学鹍), Yang Xi-Feng (杨希峰), Feng Jin-Fu (冯金福), Liu Yu-Shen (刘玉申). Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device[J]. Chin. Phys. B, 2013, 22(5): 57306-057306.

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Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device

Temperature-controllable spin-polarized current and spin polarization in a Rashba three-terminal double-quantum-dot device

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