2020 Fall Physics Colloquium 

강연일자: 2020. 11. 17. 화. 오후 5시

장소: 비대면 온라인 Zoom

강연자: 최현용 (서울대 물리천문학부)

강연주제: Ultrafast light on "exciting" van der Waals materials 

    In this colloquium, I will talk about how the extremely fast light, called “ultrafast” laser, is used to investigate “exciting” quantum properties of van der Waals materials. The key players are “symmetry” and “topology”, and they are parameterized as the quantum degrees of freedom (DoF) in van der Waals (vdW) materials by the Berry phase. Followed by an introduction about the ultrafast spectroscopy, focus will be made on the following topics. (i) Non-excitonic valley Hall effect in a heterostructure consisted of a monolayer TMD and 2D topological insulator. (ii) Exciton quantum coherence in the symmetry-broken in TMD, manifested by the quantum beats and optical Stark effect.