Phonon lifetimes in bulk AlN and their temperature dependence

Kuball, M.; Hayes, J. M.; Hayes, J.M.; Shi, Ying; Ying Shi; Edgar, J. H.; Edgar, J.H.
September 2000
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
Academic Journal
We report on the Raman analysis of the phonon lifetimes of the A[sub 1](LO) (longitudinal optical) and E[sub 2](high) phonons in bulk AlN crystals and their temperature dependence from 10 to 1275 K. Our experimental results show that amongst the various possible decay channels, the A[sub 1](LO) phonons decay primarily into two phonons of equal energy (Klemens model), most likely longitudinal-acoustic phonons, whereas the E[sub 2](high) phonon decays asymmetrically into a high-energy and a low-energy phonon. Possible decay channels of the E[sub 2](high) phonon have been shown to include combinations of E[sub 2](low) and acoustic phonons. Phonon lifetimes of the A[sub 1](LO) phonon and the E[sub 2](high) phonon of 0.75 and 2.9 ps, respectively, were measured at 10 K. © 2000 American Institute of Physics.


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