A broad, bell-shaped intensity component is observed in low-energy electron diffraction from high-quality epitaxial 2D-systems. Three 2D-systems, graphene on Ir(111), graphene on SiC(0001), and hexagonal boron nitride on Ir(111), have been prepared in situ under ultra-high vacuum conditions. In all three systems—independent of substrate material—similar strong diffuse intensity is observed, exhibiting a width as large as 50% of the Brillouin zone and an integrated intensity more than 10 times the intensity of the Bragg spots. The presented experimental results provide evidence for a common origin of such diffuse diffraction intensity in different atomically thin 2D-materials.

中文翻译：

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来自高质量外延二维材料的低能电子衍射中的非常规钟形漫散射

在来自高质量外延 2D 系统的低能电子衍射中观察到广泛的钟形强度分量。在超高真空条件下原位制备了三种二维系统，Ir(111) 上的石墨烯、SiC(0001) 上的石墨烯和 Ir(111) 上的六方氮化硼。在所有三个系统中——与衬底材料无关——观察到类似的强漫射强度，其宽度高达布里渊区的 50%，积分强度是布拉格点强度的 10 倍以上。所呈现的实验结果为不同原子级薄二维材料中这种漫射衍射强度的共同起源提供了证据。