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Isotopic Disorder: The Prevailing Mechanism in Limiting the Phonon Lifetime in Hexagonal BN

AuthorsCuscó, Ramón ; Edgar, J. H.; Liu, Song; Li, Jiahan; Artús, Lluís
hexagonal boron nitride
Issue DateApr-2020
PublisherAmerican Physical Society
CitationPhysical Review Letters, 124: 167402 (2020)
AbstractThe phonon linewidth of isotopically controlled hexagonal boron nitride (h-BN) single crystals has been determined by Raman scattering. The scattering by isotopic mass disorder induces a phonon broadening that is largest for boron 11 fractions around 0.65. Lowest-order perturbation theory does not suffice to explain the dependence of the isotopic broadening on isotopic composition. A multiple-scattering theory based on the coherent potential approximation provides a good quantitative account of the phonon shift and broadening with isotopic composition observed in the experiments. Isotopic-disorder scattering is shown to have a prominent role in limiting the optical-phonon lifetime in h-BN © 2020 American Physical Society
Publisher version (URL)https://doi.org/10.1103/PhysRevLett.124.167402
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