Photoinduced ultrafast dynamic phenomena in strongly correlated electron system
일 시 : 2022년 05월 03일 화요일 14:00
연 사 : 천 세 환 박사 (포항가속기 연구소)
장 소 : 자연과학관 226호 & 온라인 ( 회의 ID: 893 6038 1750 , 암호: 164860 )
The interplay among fundamental physical degrees of freedom such as lattice, charge, spin and orbital gives rise to a rich array of emergent material states in condensed matter. Strongly correlated electron system features the most prominent interplay and thus manifest high-temperature superconductivity, colossal magnetoresistance, quantum spin liquid, multiferroicity, and so on. These states exhibit intriguing photoinduced dynamics that realize distinct yet novel non-equilibrium states only accessible by the photoexcitation creating a new paradigm to study strongly correlated electron system. Recent development of X-ray free electron lasers (XFEL) has contributed to this research field, based on the unique capability of time-resolved X-ray scattering and spectroscopy measurements with ultrashort femtosecond X-ray pulses. In this talk, I will discuss the time-resolved X-ray scattering studies of strongly correlated electron system highlighting 1) large photomagnetic coupling in a Y-type hexaferrite, 2) a photoinduced transient orbital order in a honeycomb-lattice ruthenate, and 3) metal-insulator transition driven by photoinduced structural transformation in vanadium dioxide. I will also introduce future plans with the research perspective on photoinduced ultrafast dynamic phenomena in strongly correlated electron system that is in the spotlight for condensed matter physics.