RT info:eu-repo/semantics/article
T1 Dispersive Phonon Linewidths: TheE2Phonons of ZnO
A1 Manjón, F. J.
A1 Romero, A. H.
A1 Widulle, F.
A1 Lauck, R.
A1 Cardona, M.
A1 Serrano Gutiérrez, Jorge
AB Phonon linewidths can exhibit a large variation when either pressure or isotopic masses are changed. These effects yield detailed information about the mechanisms responsible for linewidths and lifetimes, e.g., anharmonicity or isotopic disorder. We report Raman measurements of the linewidth of the upper E2 phonons of ZnO crystals with several isotopic compositions and their dependence on pressure. Changes by a factor of 12 are observed at a given temperature. Comparison with calculated densities of one-phonon states, responsible for isotope scattering, and of two-phonon states, responsible for anharmonic decay, yields a consistent picture of these phenomena. Isotopic disorder broadening by 7  cm−1 is found in samples with mixed 16O–18O content, whereas the anharmonic processes involve decay into sums and differences of two phonons.
PB American Physical Society
SN 0031-9007
YR 2003
FD 2003
LK https://uvadoc.uva.es/handle/10324/65345
UL https://uvadoc.uva.es/handle/10324/65345
LA eng
NO Phys. Rev. Lett. 90, 055510 (2003)
DS UVaDOC
RD 22-nov-2024