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oai:docta.ucm.es:20.500.14352/450662023-08-28T17:03:23Zcom_20.500.14352_14col_20.500.14352_15

Effects of the environment on the electric conductivity of double-stranded DNA molecules Malyshev, Andrey Díaz García, Elena Domínguez-Adame Acosta, Francisco © Copyright IOP Publishing. This work was supported by Ramón y Cajal Program, MEC (Project MOSAICO), and BSCH-UCM (Project PR34/07-15916). 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. 2023-06-20T04:13:42Z 2023-06-20T04:13:42Z 2009-08-19 journal article 0953-8984 10.1088/0953-8984/21/33/335105 https://hdl.handle.net/20.500.14352/45066 http://dx.doi.org/10.1088/0953-8984/21/33/335105 http://iopscience.iop.org/ http://arxiv.org/abs/0906.4518v1 eng Project MOSAICO PR34/07-15916 open access IOP Publishing Ltd.