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

作　　者：王瑞 张存喜 周运清 孔令民 

机构地区：[1]Physics Department,Zhejiang Ocean University

出　　处：《Chinese Physics B》2011年第11期427-432,共6页中国物理B（英文版）

基　　金：supported by the Natural Science Foundation of Zhejiang Province,China(Grant Nos.Y6110250 and Y201018926)

摘　　要：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.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.

关 键 词：quantum transport DNA SUPEREXCHANGE 

分 类 号：O469[理学—凝聚态物理]