Backbone-induced semiconducting behavior in short DNA wires

Gianaurelio Cuniberti, Luis Craco, Danny Porath, Cees Dekker

Research output: Contribution to journalArticlepeer-review

205 Scopus citations


We propose a model Hamiltonian for describing charge transport through short homogeneous double stranded DNA molecules. We show that the hybridization of the overlapping π 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 quasilinear part of the current out of the gap region.

Original languageAmerican English
Article number241314
Pages (from-to)2413141-2413144
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
StatePublished - 15 Jun 2002


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