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
Spin-Filter Effect Induced by Magnetic Edge States of Zigzag Carbon Nanotube
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
摘要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.
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.
(Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems)
引用本文:
JIANG Zhan-Feng;LI Jian;SHEN Shun-Qing;LIU Wu-Ming. Spin-Filter Effect Induced by Magnetic Edge States of Zigzag Carbon Nanotube[J]. 中国物理快报, 2008, 25(4): 1431-1434.
JIANG Zhan-Feng, LI Jian, SHEN Shun-Qing, LIU Wu-Ming. Spin-Filter Effect Induced by Magnetic Edge States of Zigzag Carbon Nanotube. Chin. Phys. Lett., 2008, 25(4): 1431-1434.
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2008, Vol. 25 
