石墨烯/CrSBr异质结构中邻近诱导的电荷转移、应变和磁交换
Proximity-induced charge transfer, strain and magnetic exchange in graphene/CrSBr heterostructure
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中文总结 AI 辅助
研究石墨烯/CrSBr异质结构，结合多种技术全面光谱表征其界面，发现界面电荷重分布致CrSBr层转变，其电子结构独特且有应变，石墨烯狄拉克锥有相关特征，为下一代器件应用提供关键微观见解。
中文摘要 AI 辅助
堆叠范德华材料为通过邻近驱动相互作用来设计新兴电子和磁行为提供了有效途径。石墨烯/CrSBr异质结构已成为这一前沿领域引人注目的平台，展现出奇异的宏观响应。然而，微观电子图景仍不清晰。本文结合角分辨光电子能谱、低能电子显微镜和密度泛函理论对该界面进行了全面光谱表征。发现界面电荷大量重新分布，导致CrSBr层发生绝缘体到金属的转变，其电子结构有独特重整化，还有界面压缩应变，石墨烯狄拉克锥有类似分裂特征，为磁邻近耦合提供了可能证据。这些发现为系统的光学和输运响应提供了关键微观见解，确立了该异质结构在下一代自旋电子和纳米光子器件中的应用潜力。
英文摘要
Stacking van der Waals materials provides a powerful route to engineer emergent electronic and magnetic behaviors through proximity-driven interactions. The graphene/CrSBr heterostructure has emerged as a compelling platform in this frontier, exhibiting exotic macroscopic responses-- including uniaxial surface-plasmon-polariton propagation and an unconventional quantum Hall effect-- indicative of strong interfacial electronic and magnetic coupling. However, a microscopic electronic landscape governing these phenomena has remained elusive. Here, we provide a comprehensive spectroscopic characterization of the graphene/CrSBr interface using a combination of angle-resolved photoemission spectroscopy (ARPES), low-energy electron microscopy (LEEM), and density functional theory. We resolve a massive redistribution of interfacial charge that concurrently hole dopes graphene and populates the quasi-one-dimensional spin-polarized conduction band of CrSBr, resulting insulator-to-metal transition in the interfacial CrSBr layer. Furthermore, electronic structure of CrSBr exhibits strong momentum-dependent renormalization distinct from conventional charge doping, and theoretical modeling supported by Raman spectroscopy points to additional interfacial compressive strain. In addition, ARPES reveals a splitting-like feature in the graphene Dirac cone consistent with spin degeneracy lifting, providing possible evidence of magnetic proximity coupling. These findings provide crucial microscopic insight into the system's optical and transport responses and establish graphene/CrSBr as a versatile platform for charge-transfer control, strain-driven band engineering, magnetic-proximity coupling, and directionally confined excitations for next-generation spintronic and nanophotonic devices.
