Abstract
Longitudinal optical phonons in InN have been studied by time-resolved Raman spectroscopy on a subpicosecond time scale. The lifetimes of both the A 1 (LO) and E 1 (LO) phonons have been directly measured. From the temperature dependence of their lifetimes, the authors demonstrate that both phonons decay primarily into a large wave vector TO phonon and a large wave vector TA/LA phonon, consistent with the accepted phonon dispersion relationship for wurtzite InN. © 2007 American Institute of Physics.