题 目:Emergent Topology, Chirality and Quantum Geometry in Phonon spectra

报告人:张田田 中国科学院理论物理研究所

时 间:2026年04月20日(星期一) 下午14:30

地 点:虎溪校区理科楼物理学院 LE423

邀请人:马大帅

报告摘要:The wavefunction of phonons encodes rich quantum information, including topological and chiral properties. In phonon systems, “chirality” carries distinct meanings: topological chirality defined in k-space and rotational chirality associated with nonzero angular momentum. In this talk, I will first introduce both types of chirality and highlight key experimental observations, such as in FeSi (the first material identified with topological phonons), circularly polarized phonons in nonsymmorphic crystals like α-HgS and Te, and spin–phonon–induced circularly polarized phonons in Co₃Sn₂S₂. I will then present our recent work: a generalab initioframework, which captures electronic order-driven symmetry breaking in lattice dynamics and applies to both insulating and metallic magnets. Applying this framework to Co₃Sn₂S₂ reveals distinct microscopic origins for the E₉ and Eᵤ phonon modes.

报告人介绍:

张田田,2014年本科毕业于北京师范大学;2019年获得中国科学院物理研究所理学博士学位;2019年至2022年在日本东京工业大学先后从事博士后研究、特任助理教授工作;2023年回到中国科学院理论物理研究所工作,现任副研究员。主要从事计算凝聚态物理方向的研究工作,,相关成果入选两院院士评选的“2019年度中国十大科技进展新闻”之一。迄今共发表SCI论文50余篇,被引用四千余次,个人H因子24。2023年获得达摩院“青橙奖最具潜力奖”,2024年获得亚太物理学会凝聚态青年奖,2025年被选为亚太地区“麻省理工科技评论35岁以下35人”。