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

doi:10.1088/1674-1056/20/11/117201

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: quantum transport DNA superexchange

Received: 06 July 2011
Revised: 31 August 2011
Accepted manuscript online:

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

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