Decay of zone-center phonons in GaN with A1, E1, and E2 symmetries

D. Y. Song; S. A. Nikishin; M. Holtz; V. Soukhoveev; A. Usikov; V. Dmitriev

doi:10.1063/1.2561930

Decay of zone-center phonons in GaN with A1, E1, and E2 symmetries

D. Y. Song, S. A. Nikishin, M. Holtz, V. Soukhoveev, A. Usikov, V. Dmitriev

Electrical and Computer Engineering

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Abstract

We report Raman studies of the A1 (TO), E1 (TO), E22, A1 (LO), and E1 (LO) symmetry phonons of GaN from 20 to 325 K. By applying anharmonic decay theory to the observed temperature dependences of the phonon energies and linewidths, we determine the phonon decay mechanisms of these zone-center vibrations. Thermal expansion is taken into account using published temperature-dependent coefficients. The A1 (TO) and E1 (TO) vibrations are described by symmetric two-phonon decay. The E22 decays via the creation of three phonons. Both A1 (LO) and E1 (LO) bands are interpreted by an asymmetric two-phonon decay, with a minor contribution to the decay of the former from the three-phonon creation. Phonon lifetimes are obtained based on the observed linewidths.

Original language	English
Article number	053535
Journal	Journal of Applied Physics
Volume	101
Issue number	5
DOIs	https://doi.org/10.1063/1.2561930
State	Published - 2007

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title = "Decay of zone-center phonons in GaN with A1, E1, and E2 symmetries",

abstract = "We report Raman studies of the A1 (TO), E1 (TO), E22, A1 (LO), and E1 (LO) symmetry phonons of GaN from 20 to 325 K. By applying anharmonic decay theory to the observed temperature dependences of the phonon energies and linewidths, we determine the phonon decay mechanisms of these zone-center vibrations. Thermal expansion is taken into account using published temperature-dependent coefficients. The A1 (TO) and E1 (TO) vibrations are described by symmetric two-phonon decay. The E22 decays via the creation of three phonons. Both A1 (LO) and E1 (LO) bands are interpreted by an asymmetric two-phonon decay, with a minor contribution to the decay of the former from the three-phonon creation. Phonon lifetimes are obtained based on the observed linewidths.",

author = "Song, {D. Y.} and Nikishin, {S. A.} and M. Holtz and V. Soukhoveev and A. Usikov and V. Dmitriev",

note = "Funding Information: The authors acknowledge support for this work by the National Science Foundation (ECS-0609416 and ECS-0304224) and the J. F. Maddox Foundation. ",

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T1 - Decay of zone-center phonons in GaN with A1, E1, and E2 symmetries

AU - Song, D. Y.

AU - Nikishin, S. A.

AU - Holtz, M.

AU - Soukhoveev, V.

AU - Usikov, A.

AU - Dmitriev, V.

N1 - Funding Information: The authors acknowledge support for this work by the National Science Foundation (ECS-0609416 and ECS-0304224) and the J. F. Maddox Foundation.

PY - 2007

Y1 - 2007

N2 - We report Raman studies of the A1 (TO), E1 (TO), E22, A1 (LO), and E1 (LO) symmetry phonons of GaN from 20 to 325 K. By applying anharmonic decay theory to the observed temperature dependences of the phonon energies and linewidths, we determine the phonon decay mechanisms of these zone-center vibrations. Thermal expansion is taken into account using published temperature-dependent coefficients. The A1 (TO) and E1 (TO) vibrations are described by symmetric two-phonon decay. The E22 decays via the creation of three phonons. Both A1 (LO) and E1 (LO) bands are interpreted by an asymmetric two-phonon decay, with a minor contribution to the decay of the former from the three-phonon creation. Phonon lifetimes are obtained based on the observed linewidths.

AB - We report Raman studies of the A1 (TO), E1 (TO), E22, A1 (LO), and E1 (LO) symmetry phonons of GaN from 20 to 325 K. By applying anharmonic decay theory to the observed temperature dependences of the phonon energies and linewidths, we determine the phonon decay mechanisms of these zone-center vibrations. Thermal expansion is taken into account using published temperature-dependent coefficients. The A1 (TO) and E1 (TO) vibrations are described by symmetric two-phonon decay. The E22 decays via the creation of three phonons. Both A1 (LO) and E1 (LO) bands are interpreted by an asymmetric two-phonon decay, with a minor contribution to the decay of the former from the three-phonon creation. Phonon lifetimes are obtained based on the observed linewidths.

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VL - 101

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 5

M1 - 053535

ER -

Decay of zone-center phonons in GaN with A1, E1, and E2 symmetries

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