Chin. Phys. Lett.  2006, Vol. 23 Issue (11): 3065-3068    DOI:
Original Articles |
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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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.

Keywords: 73.23.-b      73.63.Nm      71.70.Ej     
Published: 01 November 2006
PACS:  73.23.-b (Electronic transport in mesoscopic systems)  
  73.63.Nm (Quantum wires)  
  71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I11/03065
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