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arXiv · 2302.07616

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·Wenjing Liu
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Abstract

The strong coupling between photons and matter excitations such as excitons, phonons, and magnons is of central importance in the study of light-matter interactions. Bridging the flying and stationary quantum states, the strong light-matter coupling enables the coherent transmission, storage, and processing of quantum information, which is essential for building photonic quantum networks. 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. Angle-resolved spectroscopy reveals an exceptionally high exciton-polariton coupling strength attaining 169 meV, demonstrating ultrastrong coupling that persists up to room temperature. Temperature-dependent exciton-polariton spectroscopy senses the magnetic order change from AFM to paramagnetism in CrSBr, confirming its magnetic nature. By applying an out-of-plane magnetic field, an effective tuning of the polariton energy is further achieved while maintaining the ultrastrong exciton-photon coupling strength, which is attributed to the spin canting process that modulates the interlayer exciton interaction. Our work proposes a hybrid quantum platform enabled by robust opto-electronic-magnetic coupling, promising for quantum interconnects and transducers.

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Tingting Wang, Dingyang Zhang, Shiqi Yang, Zhongchong Lin, Quan Chen, Jinbo Yang, Qihuang Gong, Zuxin Chen, Yu Ye, Wenjing Liu. 2023-02-15. Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime. https://arxiv.org/abs/2302.07616

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