物理学院学术报告（第64期）

报告题目：Catalog of phonon emergent particles

报告专家：唐峰 副教授 南京大学

报告时间：2025年11月10日（周一）16：00

报告地点：理6栋302    邀请人：邓明勋

报告内容：

The outcome of conventional topological materials prediction scheme could sensitively depend on first-principles calculations parameters. Symmetry, as a powerful tool, has been exploited to enhance the reliability of predictions. Here, we establish the relationship between the Wyckoff positions (WYPOs) and the phonon wavefunctions at each high-symmetry point (HSP) in all 230 space groups (SGs). Based on this, on one hand, we obtain a complete mapping from WYPO to the occurrence of emergent particles (EMPs) at each HSP in 230 SGs, and establish several rules of enforcing EMPs for phonons; on the other hand, we determine the contribution of the WYPO to the phonon angular momentum. Then we unambiguously identify 20,516,167 phonon EMPs in 111,872 materials in two databases. The purely symmetry-determined wavefunctions generalize the conventional Bloch theorem, could find a wide scope of application to physical properties related with basis functions of irreducible representations.

专家简介：

唐峰，南京大学物理学院副教授，从事凝聚态理论和计算物理研究。2019年9月于南京大学获得博士学位，2019年9月至2023年3月任南京大学特任研究员，2023年3月转为助理教授，2023年10月至今为准聘副教授。发表学术论文20余篇，包括以第一作者在Nature, Nature Physics, Science Advances和Phys. Rev. Lett.期刊发表论文各一篇。