Department of Physics, City College of New York, New York, NY, USA.
Department of Physics, The Graduate Center, City University of New York, New York, NY, USA.
Nature. 2023 Aug;620(7974):533-537. doi: 10.1038/s41586-023-06275-2. Epub 2023 Aug 16.
Controlling quantum materials with light is of fundamental and technological importance. By utilizing the strong coupling of light and matter in optical cavities, recent studies were able to modify some of their most defining features. Here we study the magneto-optical properties of a van der Waals magnet that supports strong coupling of photons and excitons even in the absence of external cavity mirrors. In this material-the layered magnetic semiconductor CrSBr-emergent light-matter hybrids called polaritons are shown to substantially increase the spectral bandwidth of correlations between the magnetic, electronic and optical properties, enabling largely tunable optical responses to applied magnetic fields and magnons. Our results highlight the importance of exciton-photon self-hybridization in van der Waals magnets and motivate novel directions for the manipulation of quantum material properties by strong light-matter coupling.
用光控制量子材料具有重要的基础和技术意义。通过利用光学腔中光与物质的强耦合，最近的研究能够改变它们的一些最具定义性的特征。在这里，我们研究了范德华磁体的磁光性质，该磁体即使在没有外部腔镜的情况下，也能支持光子和激子的强耦合。在这种材料——层状磁性半导体 CrSBr 中，出现了称为极化激元的新兴光物质杂化体，它们大大增加了磁、电子和光学性质之间相关性的光谱带宽，从而实现了对外加磁场和磁子的大可调谐光学响应。我们的结果强调了范德华磁体中激子-光子自杂交的重要性，并为通过强光-物质耦合来操纵量子材料性质提供了新的方向。
