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Anharmonic phonon decay in cubic GaN

Cuscó, R.; Domènech-Amador, N.; Novikov, Sergei V.; Foxon, C. Thomas; Artús, L.

Authors

R. Cuscó

N. Domènech-Amador

Sergei V. Novikov

C. Thomas Foxon

L. Artús



Abstract

We present a Raman scattering study of optical phonons in zincblende (cubic) GaN for temperatures ranging from 80 to 750 K. The experiments were performed on high quality, cubic GaN films grown by molecular beamepitaxy on GaAs (001) substrates. The observed temperature dependence of the optical phonon frequencies and linewidths is analyzed in the framework of anharmonic decay theory, and possible decay channels are discussed in the light of density-functional theory calculations. The LO mode relaxation is found to occur via asymmetric decay into acoustic phonons, with an appreciable contribution of higher order processes. The TO mode linewidth shows a weak temperature dependence and its frequency downshift is primarily determined by the lattice thermal expansion. The LO phonon lifetime is derived from the observed Raman linewidth and an excellent agreement with previous theoretical predictions is found

Journal Article Type Article
Publication Date Aug 21, 2015
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 92
Issue 7
Article Number 075206
APA6 Citation Cuscó, R., Domènech-Amador, N., Novikov, S. V., Foxon, C. T., & Artús, L. (2015). Anharmonic phonon decay in cubic GaN. Physical Review B, 92(7), https://doi.org/10.1103/PhysRevB.92.075206
DOI https://doi.org/10.1103/PhysRevB.92.075206
Publisher URL http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.075206
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Anharmonic phonon decay in cubic GaN. R. Cuscó, N. Domènech-Amador, S. Novikov, C.T. Foxon, and L. Artús, Phys. Rev. B 92, 075206.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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