Abstract
In this paper we studied the transport properties of a finite homogeneous fragments of DNA composed by N base pairs of Guanine (poly (G)) and Cytosine (poly (C)) connected to two semi-infinite leads. We study these molecules adopting different models within a nearest neighbour tight-binding approach. We proposed a semi-analytic method for the calculation of the transport properties of DNA molecules by using Green’s function techniques within a real-space renormalization scheme. We studied the transmission probability, the I–V characteristics and the Noise power of current fluctuations as a function of intrasite and DNA-leads coupling parameters. Our results show different transport regimes for these molecular systems as a function of the coupling intensities, exhibiting metal–semiconductor transitions.
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