Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10480842 | Physica A: Statistical Mechanics and its Applications | 2011 | 6 Pages |
Abstract
Within a tight-binding Hamiltonian approach, we study the dynamics of one-electron wave packets in a twisted ladder geometry with adiabatic electron-phonon interaction. The electron-phonon coupling is taken into account in the time-dependent Schrödinger equation through a cubic nonlinearity. This physical scenario incorporates several relevant ingredients to study the electronic wave packet dynamics in DNA-like segments. In the absence of nonlinearity, a random sequence of nucleotides pairs makes the wave packets remain localized, according to the standard picture of the Anderson localization. However, when the electron-phonon interaction is turned on, Anderson localization is suppressed and a subdiffusive regime takes place. Further, we show that the wave packet trapping can be controlled by an external field perpendicular to the helicity axis of the double-strand chain.
Related Topics
Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
F.A.B.F. de Moura, U.L. Fulco, M.L. Lyra, F. DomÃnguez-Adame, E.L. Albuquerque,