Absence of extended states in a ladder model of DNA



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Díaz García, Elena and Sedrakyan, A. and Sedrakyan, D. and Domínguez-Adame Acosta, Francisco (2007) Absence of extended states in a ladder model of DNA. Physical Review B, 75 (1). ISSN 1098-0121

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Official URL: http://dx.doi.org/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.

Item Type:Article
Additional Information:

© 2007 The American Physical Society.
Work at Madrid was supported by MEC Project FIS2006-01485. D.S. and A.S. acknowledges INTAS grant 03-51-5460 for partial financial support.

Uncontrolled Keywords:Metal-Insulator-Transition, Correlated Disorder, Electronic Transport, Anderson Model, Scaling Theory, Localization, Delocalization, Sequences, Molecules, Strand
Subjects:Sciences > Physics > Materials
ID Code:27363
Deposited On:21 Nov 2014 11:42
Last Modified:14 Apr 2015 10:08

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