Strong coupling between light and elementary excitations is emerging as a powerful tool to engineer the properties of solid-state systems. Spin-correlated excitations that couple strongly to optical cavities promise control over collective quantum phenomena such as magnetic phase transitions, but their suitable electronic resonances have yet to be found. Here we report strong light-matter coupling in $\textrm{NiPS}_3$, a van der Waals antiferromagnet with highly correlated electronic degrees of freedom. A previously unobserved class of polaritonic quasiparticles emerges from the strong coupling between its spin-correlated excitons and the photons inside a microcavity. Detailed spectroscopic analysis in conjunction with a microscopic theory provides unique insights into the origin and interactions of these exotic magnetically coupled excitations. Our work introduces van der Waals magnets to the field of strong light-matter physics and provides a path towards the design and control of correlated electron systems via cavity quantum electrodynamics.
Fast Programming of In-Plane Hyperbolic Phonon Polariton Optics Through van der Waals Crystals using the Phase-Change Material In3SbTe2
RWTH Aachen University（亚琛工业大学）；Juelich-Aachen Research Alliance (JARA-FIT)（于利希-亚琛研究联盟）；University of Oviedo（奥维耶多大学）；Center of Research on Nanomaterials and Nanotechnology, CINN (CSIC-Universidad de Oviedo)（纳米材料与纳米技术研究中心，CINN（西班牙国家科研委员会-奥维耶多大学））；Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies（意大利理工学院，生物分子纳米技术中心）
Active tuning of highly anisotropic phonon polaritons in van der Waals crystal slabs by gated graphene
University of Oviedo（奥维耶多大学）；Center of Research on Nanomaterials and Nanotechnology, CINN (CSIC-Universidad de Oviedo)（纳米材料与纳米技术研究中心，CINN（CSIC-奥维耶多大学））；Donostia International Physics Center (DIPC)（圣塞巴斯蒂安国际物理中心）；Moscow Institute of Physics and Technology（莫斯科物理与技术学院）；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯基克，巴斯克科学基金会）
Magnetic control of an exciton-polariton condensate in a van der Waals magnet
University of Regensburg（雷根斯堡大学）；Technical University of Munich（慕尼黑工业大学）；University of Chemistry and Technology Prague（布拉格化工大学）；Regensburg Center for Ultrafast Nanoscopy（雷根斯堡超快纳米学中心）；Université Paris Cité（巴黎西岱大学）
Local control and lateral nanofocusing of hyperbolic phonon polaritons
Korea Advanced Institute of Science and Technology (KAIST)（韩国科学技术院）；Department of Physics, University of Oviedo（奥维耶多大学物理系）；Donostia International Physics Center (DIPC)（圣塞巴斯蒂安国际物理中心）；Universidad del Pais Vasco/Euskal Herriko Unibertsitatea (UPV/EHU)（巴斯克地区大学）；Department of Biomicrosystem Technology, Korea University（韩国大学生物微系统技术系）；KU-KIST Graduate School of Converging Science and Technology, Korea University（韩基融合科学技术研究生院）；Center of Research on Nanomaterials and Nanotechnology, CINN (CSIC-Universidad de Oviedo)（纳米材料与纳米技术中心（西班牙国家科学研究委员会-奥维耶多大学））；IKERBASQUE, Basque Foundation for Science（伊克尔巴斯科奎，巴斯克科学基金会）
Exciton-polariton condensate in the van der Waals magnet CrSBr
Carl von Ossietzky University Oldenburg（奥尔登堡卡尔·冯·奥西茨基大学）；University of Exeter（埃克塞特大学）；Xiamen University Malaysia（厦门大学马来西亚分校）；Beijing University of Technology（北京工业大学）；Technion-Israel Institute of Technology（以色列理工学院）；Guangdong Technion-Israel Institute of Technology（广东以色列理工学院）；Friedrich Schiller University Jena（耶拿弗里德里希·席勒大学）；Fraunhofer-Institute for Applied Optics and Precision Engineering IOF（弗劳恩霍夫应用光学和精密工程研究所）；Max Planck School of Photonics（马克斯·普朗克光子学校）；University of Chemistry and Technology Prague（布拉格化学技术大学）；University of Sheffield（谢菲尔德大学）
Fritz Haber Institute of the Max Planck Society（马克斯·普朗克学会弗里茨·哈伯研究所）；Freie Universität Berlin（柏林自由大学）；Wuhan National Laboratory for Optoelectronics（武汉光电国家实验室）；Huazhong University of Science and Technology（华中科技大学）；Optics Valley Laboratory（光谷实验室）；Hubei Optical Fundamental Research Center（湖北光学基础研究中心）；Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy（马克斯·玻恩非线性光学与短脉冲光谱研究所）；Technische Universität Dresden（德累斯顿工业大学）；Helmholz Zentrum Dresden-Rossendorf（德累斯顿-罗斯多夫亥姆霍兹中心）
Ultra-Confinement of Polaritons in Single Atomic Layer Ag Photonic Quantum Dots
The Pennsylvania State University（宾夕法尼亚州立大学）；Joint School of Nanoscience and Nanoengineering, the University of North Carolina at Greensboro（北卡罗来纳大学格林斯伯勒分校纳米科学与工程联合学院）
Tetra-hyperbolic and tri-hyperbolic optical phases in anisotropic metamaterials without magnetoelectric coupling due to hybridization of plasmonic and magnetic Bloch high-k polaritons
Strongly Magnetically Tuned Coupling Strength and Nonlinearity in CrSBr Exciton-Polaritons
Peking University（北京大学）；Institute of Semiconductors, Chinese Academy of Sciences（中国科学院半导体研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Paderborn University（帕德博恩大学）；National Center for Nanoscience and Technology（国家纳米科学中心）；Shandong University（山东大学）；Xi’an Jiaotong University（西安交通大学）
