School of Physics, Sun Yat-sen University, 510275 Guangzhou, China.
State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, 510275 Guangzhou, China.
ACS Appl Mater Interfaces. 2023 Apr 19;15(15):19574-19581. doi: 10.1021/acsami.2c22494. Epub 2023 Apr 4.
Single-layer heterostructures of magnetic materials are unique platforms for studying spin-related phenomena in two dimensions (2D) and have promising applications in spintronics and magnonics. Here, we report the fabrication of 2D magnetic lateral heterostructures consisting of single-layer chromium triiodide (CrI) and chromium diiodide (CrI). By carefully adjusting the abundance of iodine based on molecular beam epitaxy, single-layer CrI-CrI heterostructures were grown on Au(111) surfaces with nearly atomic-level seamless boundaries. Two distinct types of interfaces, i.e., zigzag and armchair interfaces, have been identified by means of scanning tunneling microscopy. Our scanning tunneling spectroscopy study combined with density functional theory calculations indicates the existence of spin-polarized ground states below and above the Fermi energy localized at the boundary. Both the armchair and zigzag interfaces exhibit semiconducting nanowire behaviors with different spatial distributions of density of states. Our work presents a novel low-dimensional magnetic system for studying spin-related physics with reduced dimensions and designing advanced spintronic devices.
单层磁性材料异质结构是研究二维（2D）自旋相关现象的独特平台，在自旋电子学和磁子学中有广阔的应用前景。在此，我们报告了由单层三碘化铬（CrI）和二碘化铬（CrI）组成的二维磁性横向异质结构的制备。通过分子束外延法精细调整碘的丰度，在 Au(111)表面生长出近乎原子级无缝边界的单层 CrI-CrI 异质结构。通过扫描隧道显微镜确定了两种不同类型的界面，即锯齿形和扶手椅型界面。我们的扫描隧道光谱研究结合密度泛函理论计算表明，在费米能级以下和以上存在自旋极化的基态，其局域在边界处。扶手椅型和锯齿形界面均表现出不同空间分布的态密度的半导体纳米线行为。我们的工作提供了一种新型的低维磁性体系，用于研究具有减小维度的自旋相关物理和设计先进的自旋电子器件。
