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Superexchange interaction enhancement of the quantum transport in a DNA-type molecule |
Wang Rui(王瑞)†, Zhang Cun-Xi(张存喜), Zhou Yun-Qing(周运清), and Kong Ling-Min(孔令民) |
Physics Department, Zhejiang Ocean University, Zhoushan 316000, China |
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Abstract We use the transfer matrix method and the Green function technique to theoretically study the quantum tunnelling through a DNA-type molecule. Ferromagnetic electrodes are used to produce the spin-polarized transmission probability and therefore the spin current. The distance-dependent crossover comes from the topological variation from the one-dimensional to the two-dimensional model transform as we switch on the interstrand coupling; a new base pair will present N-1 extrachannels for the charge and spin as N being the total base pairs. This will restrain the decay of the transmission and improve the stability of the quantum transport. The spin and charge transfer through the DNA-type molecule is consistent with the quantum tunneling barrier.
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Received: 06 July 2011
Revised: 31 August 2011
Accepted manuscript online:
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PACS:
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72.25.-b
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(Spin polarized transport)
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73.21.La
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(Quantum dots)
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87.14.gk
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(DNA)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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Fund: Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant Nos. Y6110250 and Y201018926). |
Cite this article:
Wang Rui(王瑞), Zhang Cun-Xi(张存喜), Zhou Yun-Qing(周运清), and Kong Ling-Min(孔令民) Superexchange interaction enhancement of the quantum transport in a DNA-type molecule 2011 Chin. Phys. B 20 117201
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