题目：Condensed matter physics at attoseconds

报告人：孟胜 研究员，中国科学院物理研究所

时间：2026年6月4日（周四）15:00

地点：国家脉冲强磁场科学中心B206

报告摘要：

Photoexcitation and the resultant attosecond quasiparticle dynamics is a powerful means in distinguishing different interactions and manipulating the states of matter, especially in complex quantum materials, thus giving rise to a new focused area of ‘attosecond condensed matter physics’.Here we give some examples of such a field by investigating photoexcitation-induced correlated electron-lattice dynamics at the attosecond timescale, with the recently developed new theoretical tools incorporating both nonadiabatic electron-nuclear couplings and nuclear quantum effects. In particular, we uncover the attosecond ultrafast processes of exciton formation, evolution and dissociation in monolayer hexagonal boron nitride, and the subsequent exciton-exciton interference phenomenon, where the resulting oscillatory signals of electron occupation allow us to extract phase information of exciton envelope function. Another example is the attosecond process of high harmonics generation (HHG) in solids, where by analyzing quasiparticle-coupled HHG the electronic structure and nonadiabatic quasiparticle dynamics can be revealed. If time allowed we will also explore the potential of coherent control of quasiparticles (phonon, spin, etc.) and phase transitions with ultrafast lasers.

报告人简介：

孟胜，中国科学院物理研究所研究员、中国科学院大学岗位教授，表面物理国家重点实验室主任，美国物理学会会士，国家杰出青年科学基金获得者，国家重点研发计划项目首席科学家。2000年中国科学技术大学毕业，2004年获中国科学院物理研究所凝聚态物理博士学位、瑞典Chalmers理工大学应用物理博士学位。2005-2009年在哈佛大学物理系任博士后。2009年7月回国任入选中国科学院百人计划，任特聘研究员，现任研究员、课题组长、实验室主任。主要从事凝聚态体系的非平衡态超快量子动力学研究，发表论文200余篇，包括Phys. Rev. Lett.30余篇，Nature及其子刊20余篇，总引用24,000余次，H-index为80 (Google Scholar)。