A new type of localized fast moving electronic excitations in molecular chains

Abstract

It is shown that in a Holstein molecular chain placed in a strong longitudinal electric field some new types of excitations can arise. This excitations can transfer a charge over large distance (more than 1000 nucleotide pairs) along the chain retaining approximately their shapes. Excitations are formed only when a strong electric field either exists or quickly arises under especially preassigned conditions. These excitations transfer a charge even in the case when Holstein polarons are practically immobile. The results obtained are applied to synthetic homogeneous PolyG/PolyC DNA duplexes. They can be also provide the basis for explanation of famous H.W. Fink and C. Sch\"{o}nenberger experiment on long-range charge transfer in DNA.