Anharmonic Decay of Vibrational States in Amorphous Silicon
Jaroslav Fabian, Philip B. Allen
Abstract
Anharmonic decay rates are calculated for a realistic atomic model of amorphous silicon. The results show that the vibrational states decay on picosecond timescales and follow the two-mode density of states, similar to crystalline silicon, but somewhat faster. Surprisingly little change occurs for localized states. These results disagree with a recent experiment.
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