Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Surface Magnetism
MA 30.8: Talk
Thursday, September 8, 2022, 11:15–11:30, H48
Observation of spin-correlated exciton-polaritons in a van der Waals magnet — •Florian Dirnberger1, Rezlind Bushati1,2, Biswajit Datta1, Ajesh Kumar3, Allan H. MacDonald3, Edoardo Baldini3, and Vinod M. Menon1,2 — 1Department of Physics, City College of New York, New York, NY 10031, USA — 2Department of Physics, The Graduate Center, City University of New York, New York, NY 10016, USA — 3Department of Physics, University of Texas at Austin, Austin, TX 78712, USA
The recent discovery of optically active excitons in magnetic van der Waals crystals offers extraordinary opportunities to study collective phenomena in quantum materials via light-matter interactions. A prime candidate in this endeavor is nickel phosphorus trisulfide (NiPS3), a van der Waals antiferromagnet with highly correlated magnetic and electronic degrees of freedom. By coupling optical fields to its excitonic excitations, we demonstrate a previously unobserved class of polaritons with unique signatures of excitons, photons and spins. A detailed spectroscopic analysis of these newly formed quasiparticles in conjunction with our microscopic theory shows that magnetically coupled excitations can have an origin and interactions that are distinct from those of excitons in conventional band semiconductors.