Anharmonic phonon decay in cubic GaN
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 phon...
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| Format: | Article |
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American Physical Society
2015
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| Online Access: | https://eprints.nottingham.ac.uk/34762/ |
| _version_ | 1848794929787043840 |
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| author | Cuscó, R. Domènech-Amador, N. Novikov, Sergei V. Foxon, C. Thomas Artús, L. |
| author_facet | Cuscó, R. Domènech-Amador, N. Novikov, Sergei V. Foxon, C. Thomas Artús, L. |
| author_sort | Cuscó, R. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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 |
| first_indexed | 2025-11-14T19:24:00Z |
| format | Article |
| id | nottingham-34762 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:24:00Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-347622020-05-04T17:14:45Z https://eprints.nottingham.ac.uk/34762/ Anharmonic phonon decay in cubic GaN Cuscó, R. Domènech-Amador, N. Novikov, Sergei V. Foxon, C. Thomas Artús, L. 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 American Physical Society 2015-08-21 Article PeerReviewed Cuscó, R., Domènech-Amador, N., Novikov, Sergei V., Foxon, C. Thomas and Artús, L. (2015) Anharmonic phonon decay in cubic GaN. Physical Review B, 92 (7). 075206/1-075206/8. ISSN 2469-9969 http://journals.aps.org/prb/abstract/10.1103/PhysRevB.92.075206 doi:10.1103/PhysRevB.92.075206 doi:10.1103/PhysRevB.92.075206 |
| spellingShingle | Cuscó, R. Domènech-Amador, N. Novikov, Sergei V. Foxon, C. Thomas Artús, L. Anharmonic phonon decay in cubic GaN |
| title | Anharmonic phonon decay in cubic GaN |
| title_full | Anharmonic phonon decay in cubic GaN |
| title_fullStr | Anharmonic phonon decay in cubic GaN |
| title_full_unstemmed | Anharmonic phonon decay in cubic GaN |
| title_short | Anharmonic phonon decay in cubic GaN |
| title_sort | anharmonic phonon decay in cubic gan |
| url | https://eprints.nottingham.ac.uk/34762/ https://eprints.nottingham.ac.uk/34762/ https://eprints.nottingham.ac.uk/34762/ |