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Titre du document / Document title

A small polaron hopping model for multiphonon-assisted transport along DNA molecules, in the presence of disorder

Auteur(s) / Author(s)

TRIBERIS Georgios (1) ; SIMSERIDES Constantinos (1 2) ; KARAVOLAS Vasileios (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Physics Department, University of Athens, Panepistimiopolis, Zografos, 15784, Athens, GRECE
(2) Materials Science Department, University of Patras, Panepistimiopolis, Rio, 26504, Patras, GRECE

Résumé / Abstract

We discuss a small polaron hopping model, in order to explain the intense temperature (7) dependence of the electrical conductivity (σ) observed at high temperatures along the DNA molecules. The model takes into account the one-dimensional character of the system as well as the presence of disorder in the DNA double helix. Theoretical considerations based on percolation lead to analytical expressions for the high temperature multiphonon-assisted small polaron hopping conductivity, the maximum hopping distance and their temperature dependence. For example, experimental data for the A-phage DNA, the poly(dA)-poly(dT) DNA, and the native wet-spun calf thymus Li-DNA, follow nicely the theoretically predicted behavior, In σh ∝ T-2/3, over wide high-T ranges. In contrast to some previously presented theoretical suggestions, our model leads to realistic values for the maximum hopping distances, supporting the idea of multiphonon-assisted hopping of small polarons between next nearest neighbors of the DNA molecular "wire". We also examine the low temperature case.

Revue / Journal Title

Physica. E, low-dimentional systems and nanostructures    ISSN  1386-9477 

Source / Source

Congrès
International Conference on Modulated Semiconductor Structures No12, Albuquerque, NM , ETATS-UNIS (10/07/2005)
2006, vol. 32, no 1-2 (630 p.)  [Document : 4 p.] (12 ref.), pp. 592-595 [4 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1997) (Revue)

Mots-clés anglais / English Keywords

Disorder

;

DNA

;

Small polaron conduction

;

Analytical method

;

High temperature

;

Electrical conductivity

;

Temperature effect

;

Multiphonon process

;

Hopping conduction

;

Mots-clés français / French Keywords

8714G

;

Désordre

;

DNA

;

Conduction petit polaron

;

Méthode analytique

;

Haute température

;

Conductivité électrique

;

Effet température

;

Processus n phonons

;

Conduction saut

;

Mots-clés espagnols / Spanish Keywords

Desorden

;

DNA

;

Método analítico

;

Alta temperatura

;

Conductividad eléctrica

;

Efecto temperatura

;

Proceso n fonones

;

Conductividad salto

;

Mots-clés d'auteur / Author Keywords

87.14.Gg; 71.38.Ht; 72.80.Le

;

DNA; Small polarons; Organic semiconductors

;

Localisation / Location

INIST-CNRS, Cote INIST : 145 E, 35400011550275.1500

Nº notice refdoc (ud4) : 17836217



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