Layer‐ and Charge‐State Dependent Magnetic Proximity Modulation of Valley Excitons in MoS 2 /CrBr 3 Heterostructures

作者：Shaofei Li, Xing Xie, Junying Chen, Xian Zhang, Shikun Hou, Jun He, Guoqiang Yu, Zongwen Liu, Yanping Liu · 发表于：Small · 年份：2025 · DOI：10.1002/smll.202508423 · 被引用次数：6 · 研究领域：2D Materials and Applications、Perovskite Materials and Applications、Multiferroics and related materials

Abstract The manipulation of valley degrees of freedom in transition metal dichalcogenides (TMDCs) via the magnetic proximity effect (MPE) is key to advancing next‐generation quantum and optoelectronic technologies. However, a comprehensive understanding of how MPE depends on layer configuration and excitonic charge state remains elusive. Here, a systematic study is reported on MPE‐induced magneto‐optical responses in monolayer and bilayer MoS 2 interfaced with few and bulk CrBr 3 . Photoluminescence spectroscopy reveals a charge state dependent MPE, consistent with a spin‐aligned interfacial charge transfer mechanism. Notably, CrBr 3 introduces significant Zeeman splitting in 1L‐MoS 2 , with a large splitting of 1.49 meV at zero field, consistent with the theoretical calculation of 1.8 meV. Under high magnetic fields, the g ‐factors of neutral excitons and trions are enhanced by factors of ≈2.3 and ≈1.8, respectively. In contrast, bilayer MoS 2 exhibits a weaker response, highlighting the diminished interfacial exchange coupling in multilayer systems. The findings demonstrate a robust MPE in CrBr 3 ‐based heterostructures and provide critical insights into layer and charge state‐dependent proximity effects, paving the way for tailored valleytronic functionalities in 2D materials.