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Persistent Spin Current in a Quantum Wire with Weak Rashba Spin--Orbit Coupling |
WANG Yi1;SHENG Wei1;ZHOU Guang-Hui1,2 |
1Department of Physics, Hunan Normal University, Changsha 410081
2International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015 |
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Cite this article: |
WANG Yi, SHENG Wei, ZHOU Guang-Hui 2006 Chin. Phys. Lett. 23 3065-3068 |
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Abstract We theoretically investigate the spin current for a parabolically confined semiconductor heterojunction quantum wire with weak Rashba spin--orbit coupling by means of the perturbation method. By analytical calculation, it is found that only two components of spin current density is non-zero in the equilibrium case. Numerical examples have demonstrated that the spin current of electron transverse motion is 10-3 times that of electron longitudinal motion. However, the former one is much more sensitive to the strength of Rashba spin--orbit coupling. These results may suggest an approach to the spin storage device and to the measurement of spin current through its induced electric field.
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Keywords:
73.23.-b
73.63.Nm
71.70.Ej
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Published: 01 November 2006
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PACS: |
73.23.-b
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(Electronic transport in mesoscopic systems)
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73.63.Nm
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(Quantum wires)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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