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Phonon traces and quasilocalised vibrations in vitreous silica
Докладчик(и): Щебланов Н.С. (Université Paris-Est, Laboratoire NAVIER (UMR 8205), France) Авторы: Nikita Shcheblanov, M. Povarnitsyn, S.N. Taraskin, S.R. Elliott Дата, время проведения: 16 июня 2022 года (четверг) в 11:00 Адрес: Семинар будет проходить в режиме удаленного доступа на базе сервера BigBlueButton Аннотация In network glasses, crystalline order is lost but the short and midrange order survives in the form of the same atomic structural building blocks (units) present both in glasses and in corresponding crystals so that the vibrational motion of those might share some similarity. In the absence of a direct comparative analysis of vibrations in glasses and crystals, the following general questions remained unclear: (i) Do glassy vibrations in different frequency ranges resemble (originate from) phonons in corresponding crystals? (ii) If yes, then what are their frequency-frequency correlations, and what are the typical length scales on which the vibrations are similar? (iii) What is the role of different types of disorder in the formation of the vibrational spectrum of glasses?
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