标题： 从单层到三层 CrSBr 的磁激子对偶性 显示英文标题

标题： Magneto-Excitonic Duality From Monolayer to Trilayer CrSBr

摘要： 二维（2D）层状磁性材料（LMMs）是一类新兴的范德华材料，为研究磁激子耦合开辟了新的机会。 空气稳定、结构和光学各向异性的A型反铁磁铬硫溴化物（CrSBr）是这类LMMs中最显著的例子之一。 我们研究了单层至三层CrSBr的光致发光（PL）和PL激发，发现它表现出独特的双重特性，支持类似Frenkel和Wannier-Mott的激子。 我们的磁光实验揭示了单层和三层系统中的类似激子响应，而在双层薄片中则表现出完全不同的特征。 这表明低能激子物种（A、A'和B）在能带结构中的不同起源。 我们确认了少层CrSBr中磁激子耦合的鲁棒性。 我们的工作使对二维材料中双激子行为的更全面探索成为可能。 显示英文摘要

摘要： Two-dimensional (2D) layered magnetic materials (LMMs) are a newly emerging class of van der Waals materials, opening new opportunities to study magneto-excitonic coupling. The air-stable, structurally and optically anisotropic A-type antiferromagnetic chromium sulfur bromide (CrSBr) is one of the most prominent examples of such LMMs. We investigate photoluminescence (PL) and PL excitation of mono- to tri-layers CrSBr and find that it exhibits a unique duplexity, supporting both Frenkel- and Wannier-Mott-like excitons. Our magneto-optical experiments reveal a similar excitonic response from the mono- and trilayer systems and a completely different signature in the bilayer flake. This shows a different origin of the low-lying excitonic species (A, A', and B) in the band structure. We confirm the robustness of the magneto-excitonic coupling in few-layer CrSBr. Our work enables a more comprehensive exploration of the dual excitonic behavior in 2D materials.