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Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling

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Maciá Barber, Enrique Alfonso (2007) Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling. Physical review B, 76 (24). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.76.245123


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https://journals.aps.orgUNSPECIFIED


Abstract

In this work we consider the combined effect of helical structure and base-pair twist motion on charge transfer through duplex DNA at low temperatures. We present a fully analytical treatment of charge-lattice coupled dynamics in terms of nearest-neighbor tight-binding equations describing the propagation of the charge through an effective linear lattice for certain frequency values. The corresponding effective hopping terms include both helicoidal and dynamical effects in a unified way. Although base-pair motion generally reduces pi-pi stack overlapping, the coupling to certain normal modes gives rise to a significant improvement of the Landauer conductance.


Item Type:Article
Additional Information:

©2007 The American Physical Society.
I warmly thank Alexander Voityuk for useful comments. I acknowledge M. V. Hernández for a critical reading of the manuscript. This work has been supported by the Universidad Complutense de Madrid through Project No. PR27/05- 14014-BSCH.

Uncontrolled Keywords:Charge-transport; Poly(Da)-poly(Dt) DNA; Deoxyribonucleic-acid; Electronic states; Polaron model; Double-strand; Hole transfer; Molecules; Poly(Dg)-poly(Dc); Conductivity
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:44539
Deposited On:29 Sep 2017 17:09
Last Modified:29 Sep 2017 17:09

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