Shen Jiaying, Dong Zhengang, Qi MingQun, Zhang Yang, Zhu Chao, Wu Zhenping, Li Danfeng
State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing100876, P. R. China.
Department of Physics, City University of Hong Kong, Kowloon, Hong Kong999077, China.
ACS Appl Mater Interfaces. 2022 Nov 9;14(44):50386-50392. doi: 10.1021/acsami.2c14746. Epub 2022 Oct 26.
The design and fabrication of novel quantum devices in which exotic phenomena arise from moiré physics have sparked a new race of conceptualization and creation of artificial lattice structures. This interest is further extended to the research on thin-film transition metal oxides, with the goal of synthesizing twisted layers of perovskite oxides concurrently revealing moiré landscapes. By utilizing a sacrificial-layer-based approach, we show that such high-quality twisted bilayer oxide nanomembrane structures can be achieved. We observe atomic-scale distinct moiré patterns directly formed with different twist angles, and the symmetry-inequivalent nanomembranes can be stacked together to constitute new complex moiré configurations. This study paves the way to the construction of higher-order artificial oxide heterostructures based on different materials/symmetries and provides the materials foundation for investigating moiré-related electronic effects in an expanded selection of twisted oxide thin films.
新型量子器件的设计与制造引发了一场新的人工晶格结构概念化与创造竞赛，在这些器件中，奇异现象源自莫尔物理学。这种兴趣进一步扩展到对薄膜过渡金属氧化物的研究，目标是合成钙钛矿氧化物的扭曲层，同时揭示莫尔形貌。通过采用基于牺牲层的方法，我们展示了可以实现这种高质量的扭曲双层氧化物纳米膜结构。我们观察到直接形成的具有不同扭曲角的原子尺度明显的莫尔图案，并且对称性不等价的纳米膜可以堆叠在一起构成新的复杂莫尔构型。这项研究为基于不同材料/对称性构建高阶人工氧化物异质结构铺平了道路，并为在更多种类的扭曲氧化物薄膜中研究与莫尔相关的电子效应提供了材料基础。
