学术讲座
报告题目：Nonequilibrium electron-phonon coupling: dynamical manipulation of quantum matter
报告时间：2025-10-30 10:00
报告人：王亚娴 副研究员
中国科学院物理研究所
报告地点：翔安校区能源材料大楼3号楼会议室3
转播地点：思明校区卢嘉锡楼202报告厅，漳州校区生化主楼307教室
报告摘要：
Electron-phonon interaction is an old yet evergreen problem in condensed matter physics and materials science. It governs fundamental quantum states such as superconductivity, charge density waves, and polarons. Moreover, it plays a critical role in determining key semiconductor properties, including carrier mobility, luminescence efficiency, and optical response.
An ultrafast laser pulse can excite phase-coherent atomic motion, known as coherent phonons, thereby unlocking a new dimension for manipulating material properties. In this talk, I will introduce a general theory and dynamical simulation for the displacive excitation of coherent phonons (DECP) in solids. Specifically, I will demonstrate the directional pumping of such coherent phonons, which can drive the quasi-equilibrium lattice structure to shift along opposite directions, thereby modifying the electronic structure and inducing an ultrafast Lifshitz transition. Furthermore, I will discuss how these coherent phonons interact with the spin degree of freedom, leading to ultrafast demagnetization and the excitation of chiral phonons in a ferromagnetic monolayer. I will conclude by briefly mentioning our ongoing work, which includes formulating exciton-phonon interactions and exploring chiral-phonon-driven magnetization.
报告人简介：
王亚娴于2019年在美国俄亥俄州立大学获得博士学位，随后在哈佛大学从事博士后研究工作。2022年加入中国科学院物理研究所，担任副研究员，主要研究方向包括非常规输运性质和非平衡态动力学理论。她通过发展并运用第一性原理与多尺度模拟计算方法，与实验研究紧密结合，致力于探索量子材料中准粒子动力学的微观机制，并对其输运与响应行为进行理论预测。近五年来，已在Nature Materials, Nature Physics, Physical Review Letters, Physical Review X,Nature Communications等国内外高水平期刊发表论文30余篇，并多次受邀在美国物理年会、中国物理年会等重要学术会议上作特邀报告。
欢迎老师同学们积极参加!
化学化工学院
表界面化学全国重点实验室
