Backbone-induced semiconducting behavior in short DNA wires

Details Backbone-induced semiconducting behavior in short DNA wires Backbone-induced semiconducting behavior in short DNA wires

2002-05-17

arxiv.org/abs/cond-mat/0205367v1

Physical Review B 65, 241314(R) (2002)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.241314

We propose a model Hamiltonian for describing charge transport through short homogeneous double stranded DNA molecules. We show that the hybridization of the overlapping pi orbitals in the base-pair stack coupled to the backbone is sufficient to predict the existence of a gap in the nonequilibrium current-voltage characteristics with a minimal number of parameters. Our results are in a good agreement with the recent finding of semiconducting behavior in short poly(G)-poly(C) DNA oligomers. In particular, our model provides a correct description of the molecular resonances which determine the quasi-linear part of the current out of the gap region.

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