Strong anharmonicity effects for vibrations in crystals with impurities: local biphonons and triphonons
作者:
V.M. Agranovich,
O.A. Dubovsky,
期刊:
International Reviews in Physical Chemistry
(Taylor Available online 1986)
卷期:
Volume 5,
issue 2-3
页码: 93-100
ISSN:0144-235X
年代: 1986
DOI:10.1080/01442358609353368
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The present paper discusses special features in the formation of local vibrations in a crystal having an isotopic defect when these vibrations are in the regions of two and three-particle states of optical phonons and anharmonicity is taken into account. The existence of anharmonicity leads, in some cases, to a cardinal change in the spectrum of local states. Also considered are the conditions for the formation of local biphonons, as well as the available experimental data. Dispersion equations are derived in a number of special cases for triply-bound phonon complexes (triphonons), and conditions are discussed for their localization on an isotopic defect.
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