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.
Received: 12 January 2006
Revised: 27 July 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
Ma Song-Shan(马松山), Xu Hui(徐慧), Liu Xiao-Liang(刘小良), and Li Ming-Jun(李明君) Direct current hopping conductance along DNA chain 2007 Chinese Physics 16 862
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