报告题目 (Title)：Correlated spin and charge dynamics during ultrafast demagnetization of Ca2RuO4（Ca2RuO4超快退磁过程中的关联自旋和电荷动力学）

报告人 (Speaker)：李昕蔚 教授（新加坡国立大学）

报告时间 (Time)：2023年11月17日(周五) 14:00-14:40

报告地点 (Place)：校本部 G313

邀请人 (Inviter)：马国宏 教授

主办部门：理学院物理系

摘要 (Abstract)：

The multiband Mott insulator Ca2RuO4 has recently been reported to host an exotic antiferromagnetic ground state with excitonic character. Using magnetic field dependent time-resolved second harmonic generation polarimetry, we demonstrate an ultrafast photo-doping induced collapse of the antiferromagnetic state in Ca2RuO4. Simultaneous transient reflectivity measurements reveal that relaxation pathways of photo-dopants are intimately correlated with the dynamical evolution of the antiferromagnetic order parameter. Possible connections of our observation to the theoretical proposal of excitonic magnetism will be discussed.