Roles of dislocation density to the scattering of nano-acoustic waves in GaN

Tzu Ming Liu, Shih Ze Sun, Chieh Feng Chang, Guan Ting Chen, Chang Chi Pan, Jen Inn Chyi, Chi Kuang Sun

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We have investigated how the density of threading dislocations in GaN affects the decay of the intensity of nano-acoustic waves. We carried out measurements using a reection-type femtosecond pump probe, and thus, we determined the local dislocation density from the lifetime of nano-acoustic waves. We found that for a dislocation density of 108 cm-2, defect scattering will surmount other scattering mechanisms and dominate the attenuation of 100GHz acoustic phonons.

Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalChinese Journal of Physics
Volume49
Issue number1
StatePublished - Feb 2011

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