报告题目：Ultrafast spin current generation and manipulation

报 告 人: 吴镝，南京大学物理学院教授

报告时间：2025年5月8日16:00

报告地点：物理楼W101报告厅

内容摘要：Ultrafast spin current is an essential ingredient for high-speed spintronic devices. It is anticipated that antiferromagnets can play to their strength of ultrafast spin dynamics on the picosecond timescale to produce and manipulate picosecond spin currents. In this talk, I will introduce our understanding on the optical generation of picosecond spin current in metal/antiferromagnetic heterostructures at zero magnetic field and room temperature. The spin current originates from a magnetic-dipole nonlinear optical process due to the broken mirror symmetry. We propose a model based on the symmetry to quantitatively explain the experimental observations. Owing to the ultrashort time scale, the manipulation of the ultrafast spin current is different. We find that the direction of the spin polarization of the ultrafast spin current can be strongly modulated after the reflection from an antiferromagnet.

报告人简介：吴镝，南京大学物理学院教授。分别于1997年和2001年获得复旦大学物理学系理学学士学位和凝聚态物理专业博士学位。研究生期间曾到香港科技大学和德国Max-Plank微结构物理研究所短期访问。博士毕业后分别在美国犹他大学和加州大学河滨分校物理系作博士后。2007年到南京大学工作。主要研究方向为自旋电子学。2012年及2020年分别获得国家级人才基金。