Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 21, Issue 17, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/21/17/174205
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Measured lifetimes of hot phonons in group-III nitrides have been explained theoretically by considering three-phonon anharmonic interaction processes. The basic ingredients of the theory include full phonon dispersion relations obtained from the application of an adiabatic bond charge model and crystal anharmonic potential within the isotropic elastic continuum model. The role of various decay routes, such as Klemens, Ridley, Vallee-Bogani and Barman-Srivastava channels, in determining the lifetimes of the Raman active zone-centre longitudinal optical (LO) modes in BN (zincblende structure) and Lambda(1)(LO) modes in AlN, GaN and InN (wurtzite structure) has been quantified.
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