| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Spin Filtering in a Rashba Electron Waveguide Induced by Edge Disorder |
| XIAO Xian-Bo1,2, LI Fei2, LIU Nian-Hua1** |
1Institute for Advanced Study, Nanchang University, Nanchang 330031
2School of Computer, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004 |
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| Cite this article: |
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Abstract We theoretically study the spin-dependent electron transport in a Rashba electron waveguide with rough edges, attached to ideal leads without spin-orbit interaction. The influence of the edge disorder on the charge and spin conductances is clarified by using the spin-resolved lattice Green function method. It is found that a spin-polarized current can be generated in the output lead and its spin polarization can be manipulated by varying the waveguide length. The underlying physics is attributed to the broken longitudinal symmetry and the spin-dependent quantum interference induced by the rough boundaries. Our results may provide a new method to design a spin filter without using magnetic materials or applying a magnetic field.
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Received: 07 March 2012
Published: 31 July 2012
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| PACS: |
72.25.Dc
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(Spin polarized transport in semiconductors)
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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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