Onga Masaru, Sugita Yusuke, Ideue Toshiya, Nakagawa Yuji, Suzuki Ryuji, Motome Yukitoshi, Iwasa Yoshihiro
Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Tokyo 113-8656, Japan.
Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
Nano Lett. 2020 Jun 10;20(6):4625-4630. doi: 10.1021/acs.nanolett.0c01493. Epub 2020 May 22.
Van der Waals (vdW) heterostructures have attracted great interest because of their rich material combinations. The discovery of two-dimensional magnets has provided a new platform for magnetic vdW heterointerfaces; however, research on magnetic vdW heterointerfaces has been limited to those with ferromagnetic surfaces. Here, we report a magnetic vdW heterointerface using layered intralayer-antiferromagnetic PSe ( = Mn, Fe) and monolayer transition-metal dichalcogenides (TMDs). We found an anomalous upshift of the excitonic peak in monolayer TMDs below the antiferromagnetic transition temperature in the PSe, capturing a signature of the interlayer exciton-magnon coupling. This is a concept extended from single materials to heterointerfaces. Moreover, this coupling strongly depends on the in-plane magnetic structure and stacking direction, showing its sensitivity to their magnetic interfaces. Our finding offers an opportunity to investigate interactions between elementary excitations in different materials across interfaces and to search for new functions of magnetic vdW heterointerfaces.
范德华（vdW）异质结构因其丰富的材料组合而备受关注。二维磁体的发现为磁性vdW异质界面提供了一个新平台；然而，对磁性vdW异质界面的研究仅限于具有铁磁表面的界面。在此，我们报道了一种使用层状层内反铁磁PSe（ = Mn，Fe）和单层过渡金属二卤化物（TMDs）的磁性vdW异质界面。我们发现，在PSe中低于反铁磁转变温度时，单层TMDs中的激子峰出现异常上移，捕捉到了层间激子 - 磁振子耦合的特征。这是一个从单一材料扩展到异质界面的概念。此外，这种耦合强烈依赖于面内磁结构和堆叠方向，表明其对磁界面的敏感性。我们的发现为研究不同材料中基本激发之间跨界面的相互作用以及寻找磁性vdW异质界面的新功能提供了机会。
