Roles of Dislocation Density to the Scattering of Nano-acoustic Waves in GaN

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Title:	Roles of Dislocation Density to the Scattering of Nano-acoustic Waves in GaN
Authors:	Liu,TM;Sun,SZ;Chang,CF;Chen,GT;Pan,CC;Chyi,JI;Sun,CK
Contributors:	電機工程學系
Date:	2011
Issue Date:	2012-03-28 10:15:25 (UTC+8)
Publisher:	國立中央大學
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 reflection-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 10(8) cm(-2), defect scattering will surmount other scattering mechanisms and dominate the attenuation of 100GHz acoustic phonons.
Relation:	CHINESE JOURNAL OF PHYSICS
Appears in Collections:	[Department of Electrical Engineering] journal & Dissertation

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