报告人：何峰 教授
主持人：吴健 教授
时 间：2023年10月14日13:30至15:00
地 点：闵行校区光学大楼B325会议室
报告人简介：
何峰，上海交通大学特聘教授。主要从事超短激光脉冲和原子、分子、量子材料、真空相互作用的数值模拟研究。共发表论文一百余篇，主持科研项目十余项，其中包括上海市浦江人才、上海市曙光学者、基金委优青、基金委杰青等人才项目。2021年，获上海交通大学优秀博士生导师荣誉称号；2022年，获得上海交通大学首届“佳和优秀教学奖”。
报告内容简介：
A universal mechanism of ultrafast 2-electron orbital swap is discovered through 2-photon sequential double ionization of Li. After a 1s electron in Li is ionized by absorbing an extreme ultraviolet photon, the other 2 bound electrons located on 2 different shells have either parallel or antiparallel spin orientations. In the latter case, these 2 electrons are in the superposition of the singlet and triplet states with different energies, forming a quantum beat and giving rise to the 2-electron orbital swap with a period of several hundred attoseconds. The orbital swap mechanism can be used to manipulate the spin polarization of photoelectron pairs by conceiving the attosecond-pump attosecond-probe strategy and thus serves as a knob to control spin-resolved multielectron ultrafast dynamics [1].
[1] Hui Jiang, Zhao-Han Zhang, Yang Li, Camilo Ruiz, and Feng He, Ultrafast Science 3, 0028 (2023).