Research output: Contribution to journal › Article › peer-review
Lifetimes of confined optical phonons and the shape of a Raman peak in disordered nanoparticles. I. Analytical treatment. / Utesov, Oleg; Yashenkin, Andrey G.; Koniakhin, Sergei V.
In: Physical Review B, Vol. 102, No. 20, 205421, 16.11.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Lifetimes of confined optical phonons and the shape of a Raman peak in disordered nanoparticles. I. Analytical treatment
AU - Utesov, Oleg
AU - Yashenkin, Andrey G.
AU - Koniakhin, Sergei V.
N1 - Publisher Copyright: © 2020 American Physical Society.
PY - 2020/11/16
Y1 - 2020/11/16
N2 - Microscopic description of Raman spectra in nanopowders of nonpolar crystals is accomplished by developing the theory of disorder-induced broadening of optical vibrational eigenmodes. Analytical treatment of this problem is performed, and line shape and width are determined as functions of phonon quantum numbers, nanoparticle shape, size, and the strength of disorder. The results are found to be strongly dependent on whether the broadened line is separated from or overlaps other lines of the spectrum. Three models of disorder, i.e., weak pointlike impurities, weak smooth random potential, and strong rare impurities, are investigated in detail. The possibility of forming the phonon-impurity bound state is also studied.
AB - Microscopic description of Raman spectra in nanopowders of nonpolar crystals is accomplished by developing the theory of disorder-induced broadening of optical vibrational eigenmodes. Analytical treatment of this problem is performed, and line shape and width are determined as functions of phonon quantum numbers, nanoparticle shape, size, and the strength of disorder. The results are found to be strongly dependent on whether the broadened line is separated from or overlaps other lines of the spectrum. Three models of disorder, i.e., weak pointlike impurities, weak smooth random potential, and strong rare impurities, are investigated in detail. The possibility of forming the phonon-impurity bound state is also studied.
UR - http://www.scopus.com/inward/record.url?scp=85097135909&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/55674265-1068-3f5e-b443-e3a6eaa22d7e/
U2 - 10.1103/PhysRevB.102.205421
DO - 10.1103/PhysRevB.102.205421
M3 - Article
VL - 102
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 20
M1 - 205421
ER -
ID: 71524390