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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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| Cite this article: |
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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.
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| Keywords:
73.23.-b
73.63.Nm
71.70.Ej
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Published: 01 December 2005
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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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