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Chin. Phys. B, 2011, Vol. 20(11): 117201    DOI: 10.1088/1674-1056/20/11/117201

Superexchange interaction enhancement of the quantum transport in a DNA-type molecule

Wang Rui, Zhang Cun-Xi, Zhou Yun-Qing, Kong Ling-Min
Physics Department, Zhejiang Ocean University, Zhoushan 316000, China
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.
Keywords:  DNA      superexchange      quantum transport     
Received:  06 July 2011      Published:  15 November 2011
PACS:  72.25.-b (Spin polarized transport)  
  73.21.La (Quantum dots)  
  87.14.gk (DNA)  
  72.80.Le (Polymers; organic compounds (including organic semiconductors))  
Fund: Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant Nos. Y6110250 and Y201018926).

Cite this article: 

Wang Rui, Zhang Cun-Xi, Zhou Yun-Qing, Kong Ling-Min Superexchange interaction enhancement of the quantum transport in a DNA-type molecule 2011 Chin. Phys. B 20 117201

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