Soft-mode dynamics model of boson peak and high frequency sound in glasses: "inelastic" Ioffe-Regel crossover and strong hybridization of excitations

被引：34

作者：

Klinger, MI ^{[1
]}

Kosevich, AM

机构：

[1] Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel

[2] Natl Acad Sci, B Verkin Inst Low Temp Phys, UA-310164 Kharkov, Ukraine

来源：

PHYSICS LETTERS A | 2002年 / 295卷 / 5-6期

基金：

以色列科学基金会;

关键词：

D O I：

10.1016/S0375-9601(02)00167-6

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A theoretical model of the vibrational "high frequency dynamics", including both the boson peak (BP) and high frequency sound (HFS), is proposed for a glass. The model is an elastic continuum containing acoustic vibrations interacting with soft-mode vibrational excitations. The interaction gives rise to an "inelastic" Ioffe-Regel crossover (IRC) and related strong hybridization of the two types of excitations. The spectrum of the renormalized excitations looks as if the acoustic branch is broken into two parts separated by a narrow pseudogap related to the IRC states. For these excitations, the density of states is approximately calculated in accord with the definition of the IRC, which may exhibit features similar to those of the BP and HFS. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：311 / 317

页数：7

共 29 条

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