Backbone-induced semiconducting behavior in short DNA wires

Cuniberti, G.; Craco, L.; Porath, D.; Dekker, C.

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Backbone-induced semiconducting behavior in short DNA wires

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Cuniberti, G.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Craco, L.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Cuniberti, G., Craco, L., Porath, D., & Dekker, C. (2002). Backbone-induced semiconducting behavior in short DNA wires. Physical Review B, 65(24): 241314. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000065000024241314000001&idtype=cvips&gifs=yes&jsessionid=3051831054028635096.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-3759-7

Abstract

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 quasilinear part of the current out of the gap region.