Strong Effects of Weak Electron-Phonon Coupling

ISBN-13: 9781590338308 / Angielski / Twarda / 2003 / 109 str.

Boris P Antonuyk

Opis

It is shown in this book that the weak electron-phonon interaction can play key role in single particle behaviour at proper conditions. It drastically changes properties of the system and cannot be treated by perturbation theory of any kind despite the small interaction constant: the weak interaction becomes a source of strong effects totally determining behaviour of a system. Contrary to the widely accepted opinion it results in self-trapping of a particle in the atomic size region in one-, two- and three-dimensional ideal crystals. In the case of resonance between an impurity electron transition and local or optical phonon mode weak electron-phonon coupling forms non-linear oscillation in which energy is reversibly transmitted between the impurity electron and the lattice in spite of the numerous lattice degrees of freedom. If the energy of an impurity electron transition exceeds considerably lattice frequencies and the electron is excited by powerful resonance laser wave, this interaction makes a resonance condition dependent on the lattice variables. Population of the upper electron level shifts an atom equilibrium positions and hence the energy of the electron transition; gene