Chen Junying, Xie Xing, Oyang Xinyu, Li Shaofei, He Jun, Liu Zongwen, Wang Jian-Tao, Liu Yanping
Institute of Quantum Physics, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan, 410083, P. R. China.
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, 932 South Lushan Road, Changsha, Hunan, 410083, P. R. China.
Small. 2024 Nov;20(48):e2404346. doi: 10.1002/smll.202404346. Epub 2024 Sep 5.
Magnetic 2D materials offer a promising platform for manipulating quantum states at the nanoscale. Recent studies have underscored the significant influence of 2D magnetic materials on the optical behaviors of transition-metal dichalcogenides (TMDs), revealing phenomena such as interlayer exciton-magnon interactions, magnetization-dependent valley polarization, and an enhanced Zeeman effect. However, the controlled manipulation of anisotropic optical properties in TMDs via magnetism remains challenging. Here, the magnetic ordering in FePS profoundly impacts the optical characteristics of WSe, achieving a giant linear polarization degree of 5.1 in exciton emission is demonstrated. This is supported by a detailed analysis of low-temperature photoluminescence (PL) and Raman spectra from nL-FePS/WSe heterostructures. These findings indicate that a phase transition in FePS from paramagnetic to antiferromagnetic enhances interlayer Coulomb interactions, inducing a transition from non-polar to polar behavior in the heterostructures. Additionally, valley-polarized PL spectra under magnetic fields from -9 to 9 T reveal the influence of FePS on valley polarization and Zeeman splitting of excitons in monolayer WSe. These results present a novel strategy for tailoring the optoelectronic properties of 2D magnetic van der Waals heterostructures, paving the way for advancements in nanoscale device design.
磁性二维材料为在纳米尺度上操纵量子态提供了一个有前景的平台。最近的研究强调了二维磁性材料对过渡金属二硫属化物（TMDs）光学行为的重大影响，揭示了诸如层间激子 - 磁振子相互作用、依赖磁化的谷极化以及增强的塞曼效应等现象。然而，通过磁性对TMDs中各向异性光学性质进行可控操纵仍然具有挑战性。在此，FePS中的磁有序对WSe的光学特性产生了深刻影响，证明在激子发射中实现了5.1的巨大线性极化度。这得到了对nL - FePS/WSe异质结构低温光致发光（PL）和拉曼光谱的详细分析的支持。这些发现表明，FePS中从顺磁到反铁磁的相变增强了层间库仑相互作用，在异质结构中诱导了从非极性到极性行为的转变。此外，在-9至9 T磁场下的谷极化PL光谱揭示了FePS对单层WSe中激子的谷极化和塞曼分裂的影响。这些结果提出了一种定制二维磁性范德华异质结构光电性质的新策略，为纳米尺度器件设计的进步铺平了道路。
