Roberto de Toledo José, Serati de Brito Caique, Rosa Barbara L T, Cadore Alisson R, Rabahi César Ricardo, Faria Junior Paulo E, Ferreira de Brito Ana Carolina, Ghiasi Talieh S, Ingla-Aynés Josep, Schüller Christian, van der Zant Herre S J, Reitzenstein Stephan, Barcelos Ingrid D, Dirnberger Florian, Gobato Yara Galvão
Physics Department, Federal University of São Carlos, 13565-905 São Carlos, SP Brazil.
Institut für Festkörperphysik, Technische Universität, 10623 Berlin, Germany.
Nano Lett. 2025 Sep 3;25(35):13212-13220. doi: 10.1021/acs.nanolett.5c03150. Epub 2025 Aug 22.
van der Waals heterostructures (vdWHs) composed of transition-metal dichalcogenides (TMDs) and layered magnetic semiconductors offer great opportunities to manipulate the exciton and valley properties of TMDs. Here, we present magneto-photoluminescence (PL) studies in a WSe monolayer (ML) on a CrSBr crystal, an anisotropic layered antiferromagnetic semiconductor. Our results reveal the unique behavior of each of the ML-WSe PL peaks under a magnetic field that is distinct from the pristine case. An intriguing feature is the clear enhancement of the PL intensity that we observe each time the external magnetic field tunes the energy of an exciton in CrSBr into resonance with one of the optical states of WSe. This result suggests a magnetic field-controlled resonant energy transfer (RET) beyond other effects reported in similar structures. Our work provides deep insight into the importance of different mechanisms in magnetic vdWHs and underscores its great potential for light harvesting and emission enhancement of two-dimensional materials.
由过渡金属二硫属化物（TMDs）和层状磁性半导体组成的范德华异质结构（vdWHs）为操控TMDs的激子和能谷特性提供了绝佳机会。在此，我们展示了在CrSBr晶体（一种各向异性的层状反铁磁半导体）上的WSe单分子层（ML）中的磁光致发光（PL）研究。我们的结果揭示了在磁场下ML-WSe各PL峰的独特行为，这与原始情况不同。一个有趣的特征是，每当外部磁场将CrSBr中激子的能量调谐到与WSe的一个光学态共振时，我们观察到PL强度明显增强。这一结果表明存在一种磁场控制的共振能量转移（RET），其超越了类似结构中报道的其他效应。我们的工作深入洞察了磁性vdWHs中不同机制的重要性，并强调了其在二维材料的光捕获和发光增强方面的巨大潜力。
