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Phonon Dynamics and Lifetimes of AIN and GAN Crystallites

Published online by Cambridge University Press:  15 February 2011

Leah Bergman ,
Dimitri Alexson ,
Robert J. Nemanich ,
Mitra Dutta ,
Michael A. Stroscio ,
Cengiz Balkas  and
Robert F. Davis
Leah Bergman
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695-8202
Dimitri Alexson
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695-8202
Robert J. Nemanich
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695-8202
Mitra Dutta
Affiliation:
U. S. Army Research Office, P. O. Box 12211, Research Triangle Park, NC 27709-2211
Michael A. Stroscio
Affiliation:
U. S. Army Research Office, P. O. Box 12211, Research Triangle Park, NC 27709-2211
Cengiz Balkas
Affiliation:
Department of Materials and Science Engineering, North Carolina State University, Raleigh
Robert F. Davis
Affiliation:
Department of Materials and Science Engineering, North Carolina State University, Raleigh
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Abstract

The quasi-LO and quasi-TO modes of AIN crystallite were investigated. The analysis indicates that the Raman mode behavior concurs with Loudons’ model of mode-mixing in wurtzite (WZ) structure crystals which is due to the long-range electrostatic field. Phonon-lifetimes of GaN and AIN crystallites were studied via Raman lineshape. It was found that the low energy E2 mode lifetime is about an order of magnitude longer than that of the other modes, and that impurities impact significantly the phonon-lifetimes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 537: Symposium G – GaN and Related Alloys , 1998 , G6.65
Copyright
Copyright © Materials Research Society 1999

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