Absence of extended states in a ladder model of DNA

Details Absence of extended states in a ladder model of DNA Absence of extended states in a ladder model of DNA

2006-05-16

arxiv.org/abs/cond-mat/0605403v1

Phys. Rev. B 75, 014201 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 RevTex pages, 4 figures included

Scientific paper

10.1103/PhysRevB.75.014201

We consider a ladder model of DNA for describing carrier transport in a fully coherent regime through finite segments. A single orbital is associated to each base, and both interstrand and intrastrand overlaps are considered within the nearest-neighbor approximation. Conduction through the sugar-phosphate backbone is neglected. We study analytically and numerically the spatial extend of the corresponding states by means of the Landauer and Lyapunov exponents. We conclude that intrinsic-DNA correlations, arising from the natural base pairing, does not suffice to observe extended states, in contrast to previous claims.

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