Isotopic Disorder: The Prevailing Mechanism in Limiting the Phonon Lifetime in Hexagonal BN

被引：30

作者：

Cusco, Ramon ^{[1
]}

Edgar, James H. ^{[2
]}

Liu, Song ^{[2
]}

Li, Jiahan ^{[2
]}

Artus, Luis ^{[1
]}

机构：

[1] CSIC, Inst Jaume Almera ICTJA, Lluis Sole i Sabaris Sn, E-08028 Barcelona, Spain

[2] Kansas State Univ, Tim Taylor Dept Chem Engn, Manhattan, KS 66506 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 16期

基金：

美国国家科学基金会;

关键词：

RAMAN-SPECTRA; CRYSTALS;

D O I：

10.1103/PhysRevLett.124.167402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The phonon linewidth of isotopically controlled hexagonal boron nitride (h-BN) single crystals has been determined by Raman scattering. The scattering by isotopic mass disorder induces a phonon broadening that is largest for boron 11 fractions around 0.65. Lowest-order perturbation theory does not suffice to explain the dependence of the isotopic broadening on isotopic composition. A multiple-scattering theory based on the coherent potential approximation provides a good quantitative account of the phonon shift and broadening with isotopic composition observed in the experiments. Isotopic-disorder scattering is shown to have a prominent role in limiting the optical-phonon lifetime in h-BN

引用

页数：6

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