2025년 11월 6일(목) 물리학과 콜로퀴움 안내입니다.

연사: 김충현 교수님 (아주대)

시간: 15시~17시

강연장소: 학산도서관 지하 1층 세미나실

강연제목:  From Jahn-Teller Distortions to Spin-Orbital Entanglement: Pathways to Mott Metal-Insulator 

초록:  The Mott metal-insulator transition (Mott MIT) is one of the most prominent emergent phenomena in strongly correlated systems. Unlike conventional band insulators, Mott MIT arises from the interplay of Coulomb interaction, spin-orbit coupling, and lattice distortion, leading to novel phase transitions and electronic states. In multi-orbital systems, the lifting of orbital degeneracy plays a crucial role in determining the MIT. This can be driven by Jahn-Teller distortion, spin-orbit coupling, or a complex interplay of Hund’s coupling and Coulomb U, which can either compete or cooperate in shaping the phase transition.

In this presentation, we will discuss how key factors such as Coulomb U, lattice distortion, Hund’s coupling, and spin-orbit coupling interact to produce intriguing phase diagrams in strongly correlated materials. Specifically, we will focus on two systems: the CuAl₂O₄ spinel, where strong spin-orbit coupling leads to a novel spin-orbital-entangled state, and monolayer SrRuO₃, where a new type of Jahn-Teller distortion drives the metal-insulator transition. These cases highlight the rich physics underlying Mott MIT and provide insights into the broader implications for correlated electron systems.

Host: 김정우 교수님