»ã±¨±êÌâ (Title)£ºCorrelated spin and charge dynamics during ultrafast demagnetization of Ca2RuO4£¨Ca2RuO4³¬¿ìÍ˴Źý³ÌÖеĹØÁª×ÔÐýºÍµçºÉ¶¯Á¦Ñ§£©

»ã±¨ÈË (Speaker)£ºÀîê¿Îµ ½ÌÊÚ£¨Ð¼ÓƹúÁ¢´óѧ£©

»ã±¨¹¦·ò (Time)£º2023Äê11ÔÂ17ÈÕ(ÖÜÎå) 14:00-14:40

»ã±¨µØÖ· (Place)£ºÐ£±¾²¿ G313

Ô¼ÇëÈË (Inviter)£ºÂí¹úºê ½ÌÊÚ

Ö÷°ì²¿ÃÅ£ºÀíѧԺÎïÀíϵ

ÌáÒª (Abstract)£º

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.