Volume 33, Number 6, February III 1996
|Page(s)||459 - 464|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
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
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