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Electron wave packet dynamics in twisted nonlinear ladders with correlated disorder
Authors:FABF de Moura  UL Fulco  ML LyraF Domínguez-Adame  EL Albuquerque
Institution:
  • a Instituto de Física, Universidade Federal de Alagoas, Maceió AL 57072-970, Brazil
  • b Departamento de Biofísica e Farmacologia, Universidade Federal do Rio Grande do Norte, 59072-970, Natal-RN, Brazil
  • c Departamento de Física, Universidade Federal do Ceará, 60455-760 Fortaleza-CE, Brazil
  • d Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain
  • 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.
    Keywords:Anderson Transition  Localization  Electrons  Transport  Correlated  Disorder
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