Two-level system with a thermally fluctuating transfer matrix element: Application to the problem of DNA charge transfer

Details Two-level system with a thermally fluctuating transfer matrix element: Application to the problem of DNA charge transfer Two-level system with a thermally fluctuating transfer matrix element: Application to the problem of DNA charge transfer

2002-07-26

arxiv.org/abs/cond-mat/0207654v1

Physics

Condensed Matter

Soft Condensed Matter

original file is revtex4, 10 pages, three eps figures

Scientific paper

10.1103/PhysRevE.66.041804

Charge transfer along the base-pair stack in DNA is modeled in terms of thermally-assisted tunneling between adjacent base pairs. Central to our approach is the notion that tunneling between fluctuating pairs is rate-limited by the requirement of their optimal alignment. We focus on this aspect of the process by modeling two adjacent base pairs in terms of a classical damped oscillator subject to thermal fluctuations as described by a Fokker-Planck equation. We find that the process is characterized by two time scales, a result that is in accord with experimental findings.

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