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Exciton-polariton condensates in van der Waals magnetic microwires

Exciton-polariton condensates in van der Waals magnetic microwires

来源:Arxiv_logoArxiv
英文摘要

Quasiparticle condensates are among the most spectacular solid-state manifestations of quantum physics. Coupling macroscopic real-space wave functions to other degrees of freedom, such as the electron spin, could add valuable control knobs for quantum applications. While creating spin-carrying superconducting condensates has attracted enormous attention, man-made condensates of light-matter hybrids known as exciton-polaritons have lacked a comparable spin-related perspective. Here we open a new door by demonstrating exciton-polariton condensation in the antiferromagnetic semiconductor CrSBr, a van der Waals material with strongly intertwined optical and magnetic properties. Under photoexcitation, CrSBr microwires embedded in an optical cavity show the hallmarks of polariton condensation: a dramatic increase of the emission intensity from an excited laterally confined polariton state by multiple orders of magnitude, spectral narrowing of the emission line, and an intriguing continuous shift of the peak energy. Interferometry evidences an increase of spatial and temporal coherence. The conditions for efficient optical pumping suggest a crucial role of surface excitons and ultrafast polariton-magnon scattering. Our results highlight CrSBr microwires as a promising platform for exploring magnetically tunable polariton condensates, their directional propagation and their potential for spin-based quantum devices.

Heng Zhang、Niloufar Nilforoushan、Christian Weidgans、Julian Hirschmann、Imke Gronwald、Kseniia Mosina、Zdeněk Sofer、Fabian Mooshammer、Florian Dirnberger、Rupert Huber

光电子技术半导体技术

Heng Zhang,Niloufar Nilforoushan,Christian Weidgans,Julian Hirschmann,Imke Gronwald,Kseniia Mosina,Zdeněk Sofer,Fabian Mooshammer,Florian Dirnberger,Rupert Huber.Exciton-polariton condensates in van der Waals magnetic microwires[EB/OL].(2025-06-06)[2025-07-16].https://arxiv.org/abs/2506.06010.点此复制

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