4.6 Article

Anharmonic decay of phonons in strain-free wurtzite AlN

Journal

APPLIED PHYSICS LETTERS
Volume 85, Issue 11, Pages 1943-1945

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.1787957

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We present Raman scattering measurements on high-quality freestanding AlN single crystals. Polarization studies provide clear identification of all allowed phonons. We report the smallest phonon linewidths observed in AlN, which provide a direct measurement of the anharmonic decay of phonons in this material. Also from the Raman mode frequencies and reported index of refraction values we estimated the ordinary and extraordinary dielectric constant values. The calculated values are considerably different from previously reported values of the dielectric constant of AlN.

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