晶界声子散射中的镜面透射和漫反射
Specular transmission and diffuse reflection in phonon scattering at grain boundary
摘要：
在文献中广泛假设边界处的声子透射（前向散射）和反射（后向散射）的镜面参数相同，即，入射声子和出射声子模范围之间的跃迁概率的统计分布对于透射和反射是相同的。然而，Li和McGaughey假设需要单独的镜面参数来正确描述超晶格和多晶材料中透射和反射声子的行为。我们测试这一假设，通过分析模式分辨的镜面反射参数分别计算在石墨烯晶界的透射和反射过程。我们的研究结果表明，后向散射在大多数频率和偏振远比前向散射更扩散，为Li和McGaughey的假设提供了强有力的证据，并揭示了表面和界面如何修改纳米结构材料中域内和域间的声子输运。
英文摘要：
It is widely assumed in the literature that the specularity parameters for phonon transmission (forward scattering) and reflection (backward scattering) at a boundary are identical, i.e., the statistical distributions of the transition probabilities between an incident phonon and the range of outgoing phonon modes are the same for both transmission and reflection. However, it is hypothesized by Li and McGaughey that separate specularity parameters are needed to describe the behavior of transmitted and reflected phonons in superlattices and polycrystalline materials correctly. We test this hypothesis by analyzing the mode-resolved specularity parameters computed separately for transmission and reflection processes at a graphene grain boundary. Our results show that backward scattering is considerably more diffuse than forward scattering at most frequencies and polarizations, providing strong evidence for Li and McGaughey's hypothesis, and shed new light on how surfaces and interfaces modify phonon transport within and between domains in nanostructured materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
