声子
热导率
凝聚态物理
非谐性
静水压力
热传导
拉曼光谱
材料科学
金刚石顶砧
散射
砷化镓
光谱学
环境压力
物理
热力学
高压
光学
复合材料
量子力学
作者
Suixuan Li,Zi‐Hao Qin,Huan Wu,Man Li,Martin Kunz,Ahmet Alataş,A. Kavner,Yongjie Hu
出处
期刊:Nature
[Springer Nature]
日期:2022-11-23
卷期号:612 (7940): 459-464
被引量:23
标识
DOI:10.1038/s41586-022-05381-x
摘要
High pressure represents extreme environments and provides opportunities for materials discovery1-8. Thermal transport under high hydrostatic pressure has been investigated for more than 100 years and all measurements of crystals so far have indicated a monotonically increasing lattice thermal conductivity. Here we report in situ thermal transport measurements in the newly discovered semiconductor crystal boron arsenide, and observe an anomalous pressure dependence of the thermal conductivity. We use ultrafast optics, Raman spectroscopy and inelastic X-ray scattering measurements to examine the phonon bandstructure evolution of the optical and acoustic branches, as well as thermal conductivity under varied temperatures and pressures up to 32 gigapascals. Using atomistic theory, we attribute the anomalous high-pressure behaviour to competitive heat conduction channels from interactive high-order anharmonicity physics inherent to the unique phonon bandstructure. Our study verifies ab initio theory calculations and we show that the phonon dynamics-resulting from competing three-phonon and four-phonon scattering processes-are beyond those expected from classical models and seen in common materials. This work uses high-pressure spectroscopy combined with atomistic theory as a powerful approach to probe complex phonon physics and provide fundamental insights for understanding microscopic energy transport in materials of extreme properties.
科研通智能强力驱动
Strongly Powered by AbleSci AI