Environment effects on the electric conductivity of the DNA

Details Environment effects on the electric conductivity of the DNA Environment effects on the electric conductivity of the DNA

2009-06-24

arxiv.org/abs/0906.4518v1

J. Phys.: Condens. Matter 21 (2009) 335105.

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 2 figures, to appear in J. Phys.: Condens. Matter

Scientific paper

10.1088/0953-8984/21/33/335105

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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