The influence of polaron size on the conductivity of poly-DNA

摘要

The velocity of polaron migration in the long poly-DNA chain (~40 base pairs)in an applied electric field has been studied within a polaron model. We foundthat the polaron velocity strongly depends on the polaron size. A small polaronshows a slow propagation and strong tolerance to the electric field, while alarge polaron is much faster and less stable with increasing electric field.Moreover, the conductance of the DNA molecule within the polaron model is foundto be sensitive to structural disorders in the DNA geometry, but thatdependence diminishes with increasing temperature.