Electrical conductance in duplex DNA: Helical effects and low-frequency vibrational coupling
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 propa...
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2007 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/52101 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/52101 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 Charge-transport Poly(Da)-poly(Dt) DNA Deoxyribonucleic-acid Electronic states Polaron model Double-strand Hole transfer Molecules Poly(Dg)-poly(Dc) Conductivity Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Sumario: | 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. |
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