标题:Electrical conductance of DNA molecules with varied density of itinerant π electrons
作者:Gao, Xu-Tuan ;Fu, Xue ;Mei, Liang-Mo ;Xie, Shi-Jie
作者机构:[Gao, Xu-Tuan ;Fu, Xue ] School of Physics and Microelectronics, Shandong University, Jinan 250100, China;[Gao, Xu-Tuan ;Mei, Liang-Mo ;Xie, Shi-Jie ] 更多
来源:Journal of Chemical Physics
出版年:2006
卷:124
期:23
DOI:10.1063/1.2209238
摘要:The electrical transport of DNA is closely related to the density of itinerant π electrons because of the strong electron-lattice interaction. The resistivities of two typical DNA molecules [poly(dG)-poly(dC) and λ -DNA] with varied densities of itinerant π electrons are calculated. It is found that the dependence of the resistivity on the density of itinerant π electrons is symmetrical about the half-filling state of itinerant π electrons in poly(dG)-poly(dC). At the half-filling state, the Peierls phase transition takes place and poly(dG)-poly(dC) has a large resistivity. When the density of itinerant π electrons departs far from the half-filling state, the resistivity of poly(dG)-poly(dC) becomes small. For λ -DNA, there is no Peierls phase transition due to the aperiodicity of its base pair arrangement. The resistivity of poly(dG)-poly(dC) decreases with increasing length of the molecular chain, but the resistivity of λ -DNA increases with increasing length. The conducting mechanisms for poly(dG)-poly(dC) and a few λ -DNA molecules with varied densities of itinerant π electrons are analyzed. © 2006 American Institute of Physics.
收录类别:EI
资源类型:期刊论文
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