Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime

Tingting Wang, Dingyang Zhang, Shiqi Yang, Zhongchong Lin, Quan Chen, Jinbo Yang, Qihuang Gong, Zuxin Chen (), Yu Ye () and Wenjing Liu ()
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Tingting Wang: Peking University
Dingyang Zhang: Peking University
Shiqi Yang: Peking University
Zhongchong Lin: Peking University
Quan Chen: South China Normal University
Jinbo Yang: Peking University
Qihuang Gong: Peking University
Zuxin Chen: South China Normal University
Yu Ye: Peking University
Wenjing Liu: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Over the past few decades, exciton-polaritons have attracted substantial research interest due to their half-light-half-matter bosonic nature. Coupling exciton-polaritons with magnetic orders grants access to rich many-body phenomena, but has been limited by the availability of material systems that exhibit simultaneous exciton resonances and magnetic ordering. Here we report magnetically-dressed microcavity exciton-polaritons in the van der Waals antiferromagnetic (AFM) semiconductor CrSBr coupled to a Tamm plasmon microcavity. Using angle-resolved spectroscopy, we reveal an exceptionally high exciton-photon coupling strength, up to 169 meV, demonstrating ultrastrong coupling that persists up to room temperature. By performing temperature-dependent spectroscopy, we show the magnetic nature of the exciton-polaritons in CrSBr microcavity as the magnetic order changes from AFM to paramagnetic. By applying an out-of-plane magnetic field, we achieve effective tuning of the polariton energy while maintaining the ultrastrong exciton-photon coupling strength. We attribute this to the spin canting process that modulates the interlayer exciton interaction.

Date: 2023
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DOI: 10.1038/s41467-023-41688-7

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