Subatomic Distortion of Surface Monolayer Lattice Visualized by Moire Pattern
Subatomic Distortion of Surface Monolayer Lattice Visualized by Moire Pattern
复制标题
通过莫尔图案可视化表面单层晶格的亚原子畸变
DOI：
10.1021/acs.nanolett.0c04408
复制
发表时间：
2021
期刊：
影响因子：
10.8
通讯作者：
F. Komori
中科院分区：
文献类型：
--
作者：
T. Hattori;N. Kawamura;T. Iimori;T. Miyamachi;F. Komori
局部晶格畸变的映射需要了解薄膜的化学和物理性质的细节。然而，直接显微镜方法的分辨率不足以检测局部变形。在这里，我们已经证明，在衬底上的单原子膜的局部变形估计与高分辨率使用的地形扫描隧道显微镜图像的莫尔图案。分析集中在Cu（111）衬底上的六方氮化铁单层的莫尔图案的明显低中心。通过估计实验检测到的中心位置与从相邻中心位置提取的理想位置的位移来可视化局部失真。局部变形图显示，地下杂质优先位于大变形区域。该方法也可广泛应用于其它基片上的薄膜。
Mapping of the local lattice distortion is required to understand the details of the chemical and physical properties of thin films. However, the resolution by the direct microscopic methods was insufficient to detect the local distortion. Here, we have demonstrated that the local distortion of a monatomic film on a substrate is estimated with high resolution using the moiré pattern of the topographic scanning tunneling microscopy image. The analysis focused on the apparently low centers of the moiré pattern of the hexagonal iron nitride monolayer on the Cu(111) substrate. The local distortion was visualized by estimating the displacement of the experimentally detected center position from the ideal position that is extracted from the adjacent center positions. The map of the local distortion revealed that the subsurface impurities are preferentially located on the largely distorted areas. This approach is widely applicable to other thin films on the substrates.