Charge transfer via a two-strand superexchange bridge in DNA

Details Charge transfer via a two-strand superexchange bridge in DNA Charge transfer via a two-strand superexchange bridge in DNA

2006-03-24

arxiv.org/abs/cond-mat/0603672v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.97.106602

Charge transfer in a DNA duplex chain is studied by constructing a system with virtual electrodes connected at the ends of each DNA strand. The systeym is described by the tight-binding model and its transport is analyzed by the transfer matrix method. The very weak distance dependence in long (G:C)(T:A)_M(G:C)_3 DNA chain observed in experiment [B. Giese, et al., Nature 412, 318 (2001)] is explained by a unistep two-strand superexchange bridge without the need for the multi-step thermally-induced hopping mechanism or the dephasing effect. The crossover number M_c of (T:A) base pairs, where crossover between strong and weak distance dependence occurs, reflects the ratio of intra- and inter-strand neighboring base-base couplings.

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