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Absence of extended states in a ladder model of DNA

E. Diaz·A. Sedrakyan·D. Sedrakyan·F. Dominguez-Adame
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Abstract

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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E. Diaz, A. Sedrakyan, D. Sedrakyan, F. Dominguez-Adame. 2006-05-16. Absence of extended states in a ladder model of DNA. https://doi.org/10.1103/physrevb.75.014201

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