Chin. Phys. Lett.  2005, Vol. 22 Issue (12): 3159-3162    DOI:
Original Articles |
Conductance for a Quantum Wire with Weak Rashba Spin-Orbit Coupling
LIU Gen-Hua1;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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LIU Gen-Hua, ZHOU Guang-Hui 2005 Chin. Phys. Lett. 22 3159-3162
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Abstract We theoretically study the low temperature electron transport properties of a weak Rashba spin-orbit coupling (SOC) semiconductor quantum wire connected nonadiabatically to two electrode leads without SOC. The wire and the leads are defined by a parabolic confining potential, and the influence of both the wire-lead connection and the Rashba SOC on the electron transport is treated analytically by means of scattering matrix within effective free-electron approximation. From analytical analysis and numerical examples, we find that the system shows some fractional quantum conductance behaviour, and for some particular wire width a pure spin polarized current exists. Our result may imply a simple method for the design of a spin filter without involving any magnetic materials or magnetic fields.

Keywords: 73.23.-b      73.63.Nm      71.70.Ej     
Published: 01 December 2005
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/Y2005/V22/I12/03159
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