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28. 


Backbone-induced semiconducting behavior in short DNA wires



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

Physical Review B (Rapid Comm.) 65, 241314(R) (2002)

Selected for the July 1, 2002 issue of the
Virtual Journal of Biological Physics Research
.

We propose a model Hamiltonian for describing charge transport through short homogeneous double stranded DNA molecules. We show that the hybridization of the overlapping , 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.



online .pdf paper (for personal use only)online .pdf paper (for personal use only)
doi absolute link10.1103/PhysRevB.65.241314
online abstract at the publisher site
publisher site (ISSN:1550-235X)
online abstractarXiv preprint: cond-mat/0205367
CiteBaseCiteBase
seleceted abstractVJ Nanoscale Science & Technology entry
mpi-pks/0111001
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IF(2002): 3.327


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