SPICE Workshop on Hybrid Correlated States and Dynamics in Quantum Materials, May 14th - 16th 2024
Vinod M. Menon
1Department of Physics, The City College of New York, New York, 10025, USA
2Physics Doctoral Program, Graduate Center, The City University of New York,
New York, 10016, USA
Two-dimensional van der Waals (vdW) magnets that host excitons that show strong correlation to underlying magnetic order present a unique opportunity to realize strong interaction between magnons, excitons and photons. Furthermore, these systems facilitate the optical control of electronic and spin degrees of freedom. In this talk, I will discuss the formation of strongly coupled half-light half-matter quasiparticles, exciton-polaritons in vdW magnets [1, 2]. In the first example, I will discuss polariton formation in antiferromagnetic insulator NiPS3 and the use of polariton nonlinear spectroscopy to understand the nature of excitons in this system. Following this, I will present our recent work on magnetic semiconductor, CrSBr where in the bulk limit, the excitons are inherently dressed by photons forming self-hybridized exciton-polaritons [2]. The signature of coherent magnon oscillations imprinted on the polaritons and the potential to modify magneto-optical response by tuning the photon fraction of the polariton states will be discussed. Finally, we will discuss the effect of incoherent magnons on exciton-polaritons and the propagation of these magnetically correlated polaritonic states.
References:
[1] “Observation of spin-correlated exciton-polaritons in a van der Waals magnet, F. Dirnberger, et al. Nature Nanotechnology 17, 1060 (2022).
[2] “Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons,” F. Dirnberger et al. Nature 620, 533 (2023).