Phonon lifetimes and decay channels in single-crystalline bulk AlN

Martin Kuball; J. M. Hayes; Ying Shi; James H. Edgar

doi:10.1117/12.424745

23 April 2001 Phonon lifetimes and decay channels in single-crystalline bulk AlN

Martin Kuball, J. M. Hayes, Ying Shi, James H. Edgar

Proceedings Volume 4280, Ultrafast Phenomena in Semiconductors V; (2001) https://doi.org/10.1117/12.424745
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

We report on the Raman analysis of the phonon lifetimes and decay channels of the A₁(LO) and E₂(high) phonons of single-crystalline bulk AlN grown using the sublimation- recondensation method. The temperature dependence of the phonon lifetimes was investigated from 10 K to 1275 K. Lifetimes of the A₁(LO) phonon and the E₂(high) phonon of 0.75 ps and 2.9 ps, respectively, were measured at 10 K. Our experimental results show that the A₁(LO) phonons of AlN decay primarily into two phonons of equal energy (Klemens' decay channel), most likely longitudinal- acoustic phonons. AlN is therefore in great contrast to GaN, where a symmetric decay of the A₁(LO) phonon is not possible due to a large energy gap between the acoustic and optical phonon branches. For the E₂(high) phonon, we find an asymmetric phonon decay. Contributions from two- and three-phonon decay channels were used for the modeling of the temperature dependence of the E₂(high) phonon lifetime. Phonon lifetimes and decay channels of the E₁(LO), A₁(TO) and E₁(TO) phonons of AlN were also investigated.

Citation Download Citation

Martin Kuball, J. M. Hayes, Ying Shi, and James H. Edgar "Phonon lifetimes and decay channels in single-crystalline bulk AlN", Proc. SPIE 4280, Ultrafast Phenomena in Semiconductors V, (23 April 2001); https://doi.org/10.1117/12.424745

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