Exciton-polariton condensate in the van der Waals magnet CrSBr
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908729185665024 |
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| author | Han, Bo Shan, Hangyong Song, Kok Wee Sun, Meng Bulavin, Andrei Savenko, Ivan G. Esmann, Martin Struve, Marti Solovyeva, Vita Lackner, Lukas Eilenberger, Falk Regner, Jakub Sofer, Zdeněk Kyriienko, Oleksandr Schneider, Christian |
| author_facet | Han, Bo Shan, Hangyong Song, Kok Wee Sun, Meng Bulavin, Andrei Savenko, Ivan G. Esmann, Martin Struve, Marti Solovyeva, Vita Lackner, Lukas Eilenberger, Falk Regner, Jakub Sofer, Zdeněk Kyriienko, Oleksandr Schneider, Christian |
| contents | Van der Waals magnets are an emergent material class of paramount interest for fundamental studies in coupling light with matter excitations, which are uniquely linked to their underlying magnetic properties. Among these materials, the semiconducting magnet CrSBr is possibly a first playground where we can study simultaneously the interaction of photons, magnons, and excitons at the quantum level. Here we demonstrate a coherent macroscopic quantum phase, the bosonic condensation of exciton-polaritons, emerging in a CrSBr flake embedded in a fully tunable cryogenic open optical cavity. The Bose condensate is characterized by a highly non-linear threshold-like behavior, and coherence manifests distinctly via its first and second order quantum correlations. We find that the condensate's non-linearity is highly susceptible to the magnetic order in CrSBr. Specially, it can encounter a sign change from attractive to repulsive interactions when the intrinsic antiferromagnetic order transforms to the forced ferromagnetic order. Our findings open a route towards magnetically controllable quantum fluids of light, and optomagnonic devices where spin magnetism is coupled to on-chip Bose-Einstein condensates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18233 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exciton-polariton condensate in the van der Waals magnet CrSBr Han, Bo Shan, Hangyong Song, Kok Wee Sun, Meng Bulavin, Andrei Savenko, Ivan G. Esmann, Martin Struve, Marti Solovyeva, Vita Lackner, Lukas Eilenberger, Falk Regner, Jakub Sofer, Zdeněk Kyriienko, Oleksandr Schneider, Christian Materials Science Quantum Gases Van der Waals magnets are an emergent material class of paramount interest for fundamental studies in coupling light with matter excitations, which are uniquely linked to their underlying magnetic properties. Among these materials, the semiconducting magnet CrSBr is possibly a first playground where we can study simultaneously the interaction of photons, magnons, and excitons at the quantum level. Here we demonstrate a coherent macroscopic quantum phase, the bosonic condensation of exciton-polaritons, emerging in a CrSBr flake embedded in a fully tunable cryogenic open optical cavity. The Bose condensate is characterized by a highly non-linear threshold-like behavior, and coherence manifests distinctly via its first and second order quantum correlations. We find that the condensate's non-linearity is highly susceptible to the magnetic order in CrSBr. Specially, it can encounter a sign change from attractive to repulsive interactions when the intrinsic antiferromagnetic order transforms to the forced ferromagnetic order. Our findings open a route towards magnetically controllable quantum fluids of light, and optomagnonic devices where spin magnetism is coupled to on-chip Bose-Einstein condensates. |
| title | Exciton-polariton condensate in the van der Waals magnet CrSBr |
| topic | Materials Science Quantum Gases |
| url | https://arxiv.org/abs/2501.18233 |