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Effects of the environment on the electric conductivity of double-stranded DNA molecules

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2009-08-19
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IOP Publishing Ltd.
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We present a theoretical analysis of the effects of the environment 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 static disorder and (ii) phonon-induced scattering of the carriers between the 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. A simple physical explanation of this effect is provided.
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© Copyright IOP Publishing. This work was supported by Ramón y Cajal Program, MEC (Project MOSAICO), and BSCH-UCM (Project PR34/07-15916).
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