Localization and electron-phonon interactions in disordered systems
Ames Laboratory and Department of
Physics and Astronomy, Iowa State University, Ames, IA 50011
2 Research Center of Crete, Foundation for Research and Technology-Hellas, P.O. Box 1527, 71110 Heraklion, Crete, Greece
Accepted: 3 January 1996
We study numerically the time evolution of the coupled system of an electron, described by a tight-binding model exhibiting metal-insulator transition, interacting with vibrational degrees of freedom. Depending on the initial energy of the electron, , its effective mass, m*, on how close to the mobility edge it is and the strength of the electron-phonon coupling, different types of localized and extended states are formed. We find, that, in general, an increase of decreases the ability of the system to form localized states, a large m* does not always favor localization and polaron formation is facilitated near the mobility edge.
PACS: 71.38.+i – Polarons and electron-phonon interactions / 71.50.+t – Localized single-particle electronic states (excluding impurities) / 52.35.Mw – Nonlinear waves and nonlinear wave propagation (including parametric effects, mode coupling, ponderomotive effects, etc.)
© EDP Sciences, 1996