Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons

Florian Dirnberger (), Jiamin Quan, Rezlind Bushati, Geoffrey M. Diederich, Matthias Florian, Julian Klein, Kseniia Mosina, Zdenek Sofer, Xiaodong Xu, Akashdeep Kamra, Francisco J. García-Vidal, Andrea Alù () and Vinod M. Menon ()
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Florian Dirnberger: City College of New York
Jiamin Quan: City University of New York
Rezlind Bushati: City College of New York
Geoffrey M. Diederich: University of Washington
Matthias Florian: University of Michigan
Julian Klein: Massachusetts Institute of Technology
Kseniia Mosina: University of Chemistry and Technology Prague
Zdenek Sofer: University of Chemistry and Technology Prague
Xiaodong Xu: University of Washington
Akashdeep Kamra: Universidad Autónoma de Madrid
Francisco J. García-Vidal: Universidad Autónoma de Madrid
Andrea Alù: City University of New York
Vinod M. Menon: City College of New York

Nature, 2023, vol. 620, issue 7974, 533-537

Abstract: Abstract Controlling quantum materials with light is of fundamental and technological importance. By utilizing the strong coupling of light and matter in optical cavities1–3, recent studies were able to modify some of their most defining features4–6. Here we study the magneto-optical properties of a van der Waals magnet that supports strong coupling of photons and excitons even in the absence of external cavity mirrors. In this material—the layered magnetic semiconductor CrSBr—emergent light–matter hybrids called polaritons are shown to substantially increase the spectral bandwidth of correlations between the magnetic, electronic and optical properties, enabling largely tunable optical responses to applied magnetic fields and magnons. Our results highlight the importance of exciton–photon self-hybridization in van der Waals magnets and motivate novel directions for the manipulation of quantum material properties by strong light–matter coupling.

Date: 2023
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DOI: 10.1038/s41586-023-06275-2

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