中国物理B ›› 2007, Vol. 16 ›› Issue (3): 862-867.doi: 10.1088/1009-1963/16/3/051

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Direct current hopping conductance along DNA chain

马松山, 徐慧, 刘小良, 李明君   

  1. School of Physics and Technology, Central South University, Changsha 410083, China
  • 收稿日期:2006-01-12 修回日期:2006-07-27 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    Project supported by the Doctoral Program Foundation of Institutions of Higher Education, China (Grant No 20020533001) and Hunan provincial natural science foundation of China (Grant No 05JJ40135).

Direct current hopping conductance along DNA chain

Ma Song-Shan(马松山)†, Xu Hui(徐慧), Liu Xiao-Liang(刘小良), and Li Ming-Jun(李明君)   

  1. School of Physics and Technology, Central South University, Changsha 410083, China
  • Received:2006-01-12 Revised:2006-07-27 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    Project supported by the Doctoral Program Foundation of Institutions of Higher Education, China (Grant No 20020533001) and Hunan provincial natural science foundation of China (Grant No 05JJ40135).

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摘要： This paper proposes a model of direct current (DC) electron hopping transport in DNA, in which DNA is considered as a binary one-dimensional disordered system. To quantitatively study the DC conductivity in DNA, it numerically calculates the DC conductivity of DNA chains with different parameter values. The result shows that the DC conductivity of DNA chain increases with the increase of temperature. And the conductivity of DNA chain is depended on the probability p, which represents the degree of compositional disorder in a DNA sequence to some extent. For p<0.5, the conductivity of DNA chain decreases with the increase of p, while for p\geq0.5, the conductivity increases with the increase of p. The DC conductivity in DNA chain also varies with the change of the electric field, it presents non-Ohm's law conductivity characteristics.

关键词: DNA chain, hoping transport, DC conductivity, compositional disorder

Abstract: This paper proposes a model of direct current (DC) electron hopping transport in DNA, in which DNA is considered as a binary one-dimensional disordered system. To quantitatively study the DC conductivity in DNA, it numerically calculates the DC conductivity of DNA chains with different parameter values. The result shows that the DC conductivity of DNA chain increases with the increase of temperature. And the conductivity of DNA chain is depended on the probability $p$, which represents the degree of compositional disorder in a DNA sequence to some extent. For $p<0.5$, the conductivity of DNA chain decreases with the increase of $p$, while for $p\geq0.5$, the conductivity increases with the increase of $p$. The DC conductivity in DNA chain also varies with the change of the electric field, it presents non-Ohm's law conductivity characteristics.

Key words: DNA chain, hoping transport, DC conductivity, compositional disorder

中图分类号:  (Nucleic acids)

  • 87.14.G-
72.20.Ee (Mobility edges; hopping transport) 87.15.A- (Theory, modeling, and computer simulation) 87.15.Cc (Folding: thermodynamics, statistical mechanics, models, and pathways) 87.15.Vv (Diffusion)