Electrons in Dry DNA from Density Functional Calculations

Details Electrons in Dry DNA from Density Functional Calculations Electrons in Dry DNA from Density Functional Calculations

2002-09-24

arxiv.org/abs/cond-mat/0209563v1

Mol. Phys. v.101 pp.1587-1594 (2003)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures

Scientific paper

10.1080/0026897031000068587

The electronic structure of an infinite poly-guanine - poly-cytosine DNA molecule in its dry A-helix structure is studied by means of density-functional calculations. An extensive study of 30 nucleic base pairs is performed to validate the method. The electronic energy bands of DNA close to the Fermi level are then analyzed in order to clarify the electron transport properties in this particularly simple DNA realization, probably the best suited candidate for conduction. The energy scale found for the relevant band widths, as compared with the energy fluctuations of vibrational or genetic-sequence origin, makes highly implausible the coherent transport of electrons in this system. The possibility of diffusive transport with sub-nanometer mean free paths is, however, still open. Information for model Hamiltonians for conduction is provided.

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