Intrinsic scattering channels and selection rules in four-phonon interactions

被引：6
作者：
Lin, Ying-Qin [1 ]
Cao, Shu-Hao [1 ]
Hu, Cui-E [2 ]
Geng, Hua-Yun [3 ]
Chen, Xiang-Rong [1 ]
机构：
[1] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610064, Peoples R China
[2] Chongqing Normal Univ, Coll Phys & Elect Engn, Chongqing 401331, Peoples R China
[3] CAEP, Inst Fluid Phys, Natl Key Lab Shock Wave & Detonat Phys Res, Mianyang 621900, Peoples R China
来源：
PHYSICAL REVIEW B | 2024年 / 110卷 / 07期
基金：
中国国家自然科学基金;
关键词：
HIGH THERMAL-CONDUCTIVITY; TRANSPORT;
D O I：
10.1103/PhysRevB.110.075414
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose selection rules for four-phonon (4ph) scattering that clarify the predominance of the redistribution process. The cutoff frequencies for specific scattering channels are identified, with their feasibility determined by the magnitude of the a-o gap. We obtain substantive evidence to support the fact that the enhancement of 4ph scattering is due to the flat phonon dispersion. An extremely strong intraband scattering in the ZA branch is identified beyond expectation. The same enhancing effect can manifest between homothetic branches as an enhancement mechanism of interband scattering. The homothety is associated with the distribution trend of phonon group velocity, which can anticipate the intensity of 4ph scattering. Our work provides insights and perspectives into 4ph interaction.
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页数：7
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