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Spin-Filter Effect Induced by Magnetic Edge States of Zigzag Carbon Nanotube |
| JIANG Zhan-Feng1,2;LI Jian2;SHEN Shun-Qing2;LIU Wu-Ming1 |
| 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802Department of Physics, and Center of Theoretical and Computational Physics, The University of Hong Kong, Hong Kong |
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| Cite this article: |
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JIANG Zhan-Feng, LI Jian, SHEN Shun-Qing et al 2008 Chin. Phys. Lett. 25 1431-1434 |
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Abstract Spin-filter effect is predicted in a weak coupled junction composed of a nonmagnetic metal electrode and a zigzag carbon nanotube. This effect is induced by the magnetic edge states of the nanotube, and can produce spin-polarized current in the absence of an external magnetic field. We find that the spin polarization of the current changes its sign at the half-filling
point of the nanotube, thus electric field control of spin transport can be realized. Furthermore, we find the coupling strength of the junction may cause a magnetic transition on the edge of the nanotube.
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| Keywords:
73.63.Fg
77.22.Ej
71.10.Hf
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Received: 17 January 2008
Published: 31 March 2008
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| PACS: |
73.63.Fg
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(Nanotubes)
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77.22.Ej
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(Polarization and depolarization)
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71.10.Hf
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(Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems)
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