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



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Malyshev, Andrey and Díaz García, Elena and Domínguez-Adame Acosta, Francisco (2009) Effects of the environment on the electric conductivity of double-stranded DNA molecules. Journal of physics: condensed matter, 21 (33). ISSN 0953-8984

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Official URL: http://dx.doi.org/10.1088/0953-8984/21/33/335105


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.

Item Type:Article
Additional Information:

© Copyright IOP Publishing.
This work was supported by Ramón y Cajal Program, MEC (Project MOSAICO), and BSCH-UCM (Project PR34/07-15916).

Uncontrolled Keywords:Localized Frenkel excitons; Temperature-dependence; Radiative lifetime; Transport; Sequence; Statistics; Dynamics; Disorder; Chains; Length
Subjects:Sciences > Physics > Materials
ID Code:37885
Deposited On:25 May 2016 15:37
Last Modified:12 Feb 2018 15:10

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