时间：2025年7月16日（星期三）下午16:00-17:30

Time:16:00-17:30, Wednesday, July 16, 2025

主持人：西湖大学理学院化学系PI 窦文杰

Host: Dr. Wenjie Dou, PI of School of Science, Westlake University

地点：云谷校区E10-222

Venue: E10-222, Yungu Campus, Westlake University

报告语言：英文

Lecture Language: English

Prof. Eberhard K. U. Gross

Fritz Haber Center for Molecular Dynamics

The Hebrew University of Jerusalem, Israel

主讲人/Speaker:

Eberhard K. U. Gross is a professor at Fritz Haber Center for Molecular Dynamics at the Hebrew University of Jerusalem since 2017. He got his Ph.D. from J.W. Goethe University Frankfurt in 1980. With an extensive career spanning several decades, he has held many positions across Europe and the United States, including director at the Max Planck Institute of Microstructure Physics and Honorary Professor at Martin Luther University, Halle. Professor E. K. U. Gross’s research areas lie in quantum chemistry and dynamics, light-induced processes and spectroscopy, materials and electronic structure, quantum statistical mechanics and thermodynamics. Professor E. K. U. Gross is internationally renowned for his foundational contributions to the development and application of density functional theory (DFT), particularly pioneering the field of time-dependent density functional theory (TDDFT). His works have been cited with an H-index of 101 and over 59,500 citations. He has received many prestigious honors and awards, including the prestigious Berni Alder CECAM prize for outstanding contributions to computer simulations in condensed matter physics, and the Tsungming Tu Prize. He is an elected member of the International Academy of Quantum Molecular Science and a Fellow of the American Physical Society.

讲座摘要/Abstract:

This lecture is about the motion of electrons on the femto- and atto-second time scale; how it can be monitored, analyzed and, ultimately, controlled with ultra-short laser pulses. Real-time simulations are performed employing the ab-initio approach of time-dependent density functional theory (TDDFT). We shall visualize the laser-induced formation and breaking of chemical bonds in real time, and we shall highlight non-steady-state features of the electronic current through nano-scale junctions. In particular, current-induced forces on the nuclei in these junctions show an intricate interplay between electronic friction and the “electron wind” force, allowing for the design of an atomic “waterwheel”. Other phenomena showing a subtle balance of electronic and nuclear currents, such as vibrational circular dichroism, will be tackled using the exact-factoriztion approach. With the goal of pushing magnetic storage processes towards ever shorter time scales, we demonstrate that in many materials the local magnetic moment can be manipulated with ultrafast laser pulses. The underlying mechanism is an optically induced spin transfer (OISTR) from one magnetic sub-lattice to another. As an all-optical process, OISTR is temporally limited by the duration of the laser pulse, which may be in the atto-second regime. The OISTR effect was first predicted in 2016 by TDDFT calculations and two years later confirmed in several experiments, marking the birth of “atto-magnetism”.

讲座联系人/Contact:

School of Science, Yanyan Chen, Email: chenyanyan@westlake.edu.cn