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arXiv 0906.4518cond-mat.softcond-mat.mes-hall
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环境对DNA导电性的影响

Environment effects on the electric conductivity of the DNA

A. V. Malyshev, E. Diaz, F. Dominguez-Adame, V. A. Malyshev

摘要:

我们提出了一个理论分析的环境效应对双链合成聚(G)-聚(C)DNA分子的电荷传输连接到两个理想的铅。DNA与环境的耦合导致两种效应:(i)由于静态无序导致的载流子功能的局部化和(ii)这些局部化状态之间的载流子的声子诱导的散射,导致跳跃导电性。一个非线性泡利主方程的局域态的人口被用来描述跳跃的运输和计算的电流作为一个功能的应用偏压。我们证明,虽然在状态密度的电子间隙收缩的无序增加,电压间隙的$I-V$特性变得更宽。对这种效应给出了简单的物理解释。

英文摘要:

We present a theoretical analysis of the environment effects on charge transport in double-stranded synthetic poly(G)-poly(C) DNA molecules attached to two ideal leads. Coupling of the DNA to the environment results in two effects: (i) localization of carrier functions due to the static disorder and (ii) phonon-induced scattering of the carrier between these localized states, resulting in hopping conductivity. A nonlinear Pauli master equation for populations of localized states is used to describe the hopping transport and calculate the electric current as a function of the applied bias. We demonstrate that, although the electronic gap in the density of states shrinks as the disorder increases, the voltage gap in the $I-V$ characteristics becomes wider. Simple physical explanation of this effect is provided.

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