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Charge transfer along the base-pair stack in DNA is modeled in terms ofthermally-assisted tunneling between adjacent base pairs. Central to ourapproach is the notion that tunneling between fluctuating pairs is rate-limitedby the requirement of their optimal alignment. We focus on this aspect of theprocess by modeling two adjacent base pairs in terms of a classical dampedoscillator subject to thermal fluctuations as described by a Fokker-Planckequation. We find that the process is characterized by two time scales, aresult that is in accord with experimental findings.Comment: original file is revtex4, 10 pages, three eps figure

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