Argonne Materials Science Seminar: Youngjun Ahn, University of Michigan
- When:
- Monday, January 8, 2024 11:00 am - 12:00 pm
- Where:
- Argonne National Laboratory, Building 242, Room H202, 9700 S. Cass Ave., Lemont, IL 60439 and Virtual
- Speaker:
- Youngjun Ahn, University of Michigan
- Title:
- Toward symmetry-resolved visualization of quantum materials
- Description:
-
In the era of quantum materials, the understanding of many novel quantum phenomena has been made based on two pillars – nontrivial electronic topologies and spontaneous broken symmetries. In particular, the role of symmetry of material systems has been a beacon for understanding the nature of correlated emergent phenomena and becoming a critical knob to realize novel topological quantum states.
In this seminar, I will discuss our recent progress in deciphering symmetries of quantum materials, made by developing nonlinear optical techniques. I will showcase our success in revealing otherwise hidden magnetic states in two quantum magnetic systems: (i) dual magnetism in a magnetic Weyl semimetal Co3Sn2S2; and (ii) helical phase and helicity domains in a helimagnet Cr1/3NbS2, based on which I will also discuss the significance of these magnetism to the electronic topology. Finally, I will finish by highlighting my future research direction in developing a multimodal probe to comprehensively explore both topology and symmetry in quantum materials.