Decay of high-frequency phonons in amorphous silicon

A.J. Scholten, J.I. Dijkhuis

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present measurements concerning the dynamics of high-frequency phonons (ħω≥150 cm−1) in amorphous silicon at 2 K. From pulsed anti-Stokes Raman experiments, estimates of the population decay time are obtained for high-frequency phonons, generated by fast carrier relaxation. The fracton model explains the counterintuitive sense of the decay-time dependence on frequency in terms of the decrease of the localization length of the vibrational states towards higher frequencies, and the concomitant suppression of the anharmonic decay rate. This model fits our data with a very realistic third-order elastic constant
Original languageEnglish
Article number3837
Pages (from-to)3837-3840
Number of pages1
JournalPhysical review. B, condensed matter
Volume53
DOIs
Publication statusPublished - 1996

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