Multiphonon anharmonic decay of a quantum mode
Institute of Theoretical Physics, University of Tartu - Tähe 4, 51014
Institute of Physics, University of Tartu - Riia 142, 51014 Tartu, Estonia
Accepted: 14 December 1998
A nonperturbative theory of multiphonon anharmonic transitions between energy levels of a local mode is presented. It is shown that the rate of transitions rearranges near the critical level number ncr: at smaller n the process slows down, while at larger n it accelerates in time, causing a jump-like loss of energy followed by the generation of phonon bursts. Depending on parameters, phonons are emitted in pairs, triplets etc.
PACS: 71.23.An – Theories and models; localized states / 71.55.-i – Impurity and defect levels
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