Self-trapping of interacting electrons in crystalline nonlinear chains |
| |
Authors: | W S Dias M L Lyra F A B F de Moura |
| |
Institution: | 1.Instituto de Física,Universidade Federal de Alagoas,Maceió AL,Brazil |
| |
Abstract: | Considering the nonlinearity arising from the interaction between electrons and latticevibrations, an effective electronic model with a self-interaction cubic term is employedto study the interplay between electron-electron and electron-phonon interactions. Basedon numerical solutions of the time-dependent nonlinear Schroedinger equation for aninitially localized two-electron singlet state, we show that the magnitude of theelectron-phonon coupling χ necessary to promote the self-trapping of theelectronic wave packet decreases as a function of the electron-electron interactionU. We show that such dependence is directly linked to the narrowing ofthe band of bounded two-electron states as U increases. We obtain thetransition line in the χ × U parameter space separatingthe phases of self-trapped and delocalized electronic wave packets. The present resultsindicates that nonlinear contributions plays a relevant role in the electronic wave packetdynamics, particularly in the regime of strongly correlated electrons. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|