Exciton-Coupled Coherent Magnons and What’s Next?
While magnons and excitons differ significantly in their energy scales, up to four orders of magnitude, their coupling can lead to efficient optical access to spin information. In this talk, I will discuss how a two-dimensional (2D) magnetic semiconductor, CrSBr, can possess tightly bound excitons with large oscillator strength and long-lived coherent magnons due to the presence of bandgap and spatial confinement. I will talk about optical excitation and detection of exciton-coupled magnon dynamics using time- and spatially resolved optical spectroscopy and role of magnon-exciton coupling in magnon dynamics and light-induced phase transitions. Finally, I will discuss how these properties of magnetic semiconductors can be harnessed for spintronic devices and quantum information science.
Bio: Youn Jue (Eunice) Bae is an assistant professor in the Department of Chemistry and Chemical Biology at Cornell University. She obtained her B.S. in chemistry at UC Berkeley, and Ph.D. in chemistry at Northwestern University and spent 3 years as a postdoctoral researcher at Columbia University.
Bae’s most recent work demonstrated the first instance of magnon-exciton coupling in a magnetic semiconductor. This coupling opens up an exciting opportunity in creating quantum transducers and magnon-based computing with all-optical control. The overarching goal of the Bae group is to understand the interaction between electron spins and excitons, phonons, and magnons in various solid-state materials and use these interactions to dynamically control spins.