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Бозонный пик в Ð´Ð²ÑƒÐ¼ÐµÑ€Ð½Ñ‹Ñ Ð¸ Ñ‚Ñ€ÐµÑ Ð¼ÐµÑ€Ð½Ñ‹Ñ Ð½ÐµÑƒÐ¿Ð¾Ñ€ÑÐ´Ð¾Ñ‡ÐµÐ½Ð½Ñ‹Ñ ÑÐ¸ÑÑ‚ÐµÐ¼Ð°Ñ

выпускная квалификационная работа бакалавра

Бозонный пик в Ð´Ð²ÑƒÐ¼ÐµÑ€Ð½Ñ‹Ñ Ð¸ Ñ‚Ñ€ÐµÑ Ð¼ÐµÑ€Ð½Ñ‹Ñ Ð½ÐµÑƒÐ¿Ð¾Ñ€ÑÐ´Ð¾Ñ‡ÐµÐ½Ð½Ñ‹Ñ ÑÐ¸ÑÑ‚ÐµÐ¼Ð°Ñ

Abstract

Работа посвящена исследованию бозонного пика, наблюдаемого во всех неупорядоченных (аморфных) системах, с помощью теории случайных матриц. Путем расчета плотности распределения собственных чисел случайной динамической матрицы получено, что в двумерных аморфных системах, наряду с трехмерными, существует избыточная, по сравнению с дебаевской, плотность колебательных состояний (бозонный пик). Это позволяет говорить о бозонном пике как об универсальном свойстве ансамбля случайных матриц. В рамках такого подхода в данной работе найдены аналитические уравнения, описывающие бозонный пик в трехмерных системах. Анализ этих уравнений показывает, что существуют две разные по типу колебаний области плотности состояний, разделенные бозонным пиком. Получено теоретическое обоснование линейной корреляции между частотой бозонного пика, частотой Иоффе-Регеля и упругими модулями аморфной системы, отмеченной ранее во многих работах.

This work is dedicated to the study of the boson peak, which observed in all disordered (amorphous) systems, by the random matrix theory. Used to a calculation of the distribution of the eigenvalues of the random dynamical matrix it was obtained, that in two-dimensional systems, as well as in third-dimensional, exists the excessive on the Debye density of states, so-called the boson peak. It allows us to talk about the boson peak as a universal property of the random matrices ensemble. In this framework in the present work, it was found of the analytical equations, describing the boson peak form in the third-dimensional case. Analyze of these equations shows, that exist two different on type vibrational area, separated by boson peak. It was obtained the theoretical justification of the linear correlation between the boson peak frequency, the Ioffe-Regel frequency and elasticity modules of amorphous systems, early observed in many works.

Keywords

диффузоны, бозонный пик, закон Дебая, random matrix theory, amorphous solids, Ioffe-Regel frequency, boson peak, diffusons, ансамбль Вишерта, Wishart ensemble, Debye’s law, аморфные тела, теория ÑÐ»ÑƒÑ‡Ð°Ð¹Ð½Ñ‹Ñ Ð¼Ð°Ñ‚Ñ€Ð¸Ñ†Ñ‹, частота Иоффе-Регеля

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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