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Environment effects on the electric conductivity of the DNA | A.V. Malyshev
; E. Diaz
; F. Dominguez-Adame
; V.A. Malyshev
; | Date: |
24 Jun 2009 | Abstract: | 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. | Source: | arXiv, 0906.4518 | Services: | Forum | Review | PDF | Favorites |
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