Origin of the boson peak in systems with lattice disorder

被引：254

作者：

Taraskin, SN

Loh, YL

Natarajan, G

Elliott, SR

机构：

[1] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England

[2] Univ Cambridge Trinity Coll, Cambridge CB2 1TQ, England

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.86.1255

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The origin of the boson peak in models with force-constant disorder has been established by calculations using the coherent potential approximation. The analytical results obtained are supported by precise numerical solutions. The boson peak in the disordered system is associated with the lowest van Hove singularity in the spectrum of the reference crystalline system, pushed down in frequency by disorder-induced level-repelling and hybridization effects.

引用

页码：1255 / 1258

页数：4

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