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报告题目：Phonon lifetimes in one dimensional anharmonic chains

报 告 人：张勇副教授 厦门大学

报告时间：2016年6月14日（星期二）下午2:30

报告地点：格致楼5004会议室

报告摘要：We scrutinize the effects of the anharmonicity on phonon lifetime in one dimensional chains via molecular dynamic simulations. Our results demonstrate that the asymmetry of interaction potentials produce a significant impact on lifetimes of phonons, which the theories based on phonon Boltzmann equations fail to predict. We identify a new phonon-scattering mechanism induced alone by the asymmetry of the interaction potential and suggest a microscopic picture to understand such a new mechanism. More importantly, strong asymmetry combined with moderate (symmetric) nonlinearity will make most phonons exhibiting glasslike behaviors. Our findings provide a new insight to understand anharmonicity induced ultralow heat conduction in crystals, which is important in searching and designing more efficient thermoelectric materials.

报告人简介：张勇，厦门大学物理系副教授，本科、硕士和博士都毕业于兰州大学物理系。目前科研兴趣为低维能量输运和非平衡态统计物理的基本问题等。