表面和次表面旋转层石墨STM图像上的莫尔条纹
Moiré patterns on STM images of graphite from surface and subsurface rotated layer
摘要：
我们已经观察到与STM莫尔图案对应的一个石墨烯层在HOPG表面上的旋转。莫尔条纹的特征在于旋转角度和在平面内的延伸。此外，通过识别边界域和缺陷，我们可以区分由于表面或次表面层上的旋转引起的莫尔图案。为了更好地理解莫尔图案的形成，我们通过第一原理研究了三个石墨烯层的阵列，其中顶部或中间层出现围绕堆叠轴旋转。我们比较了实验和理论结果，我们表明在相应的STM图像的莫尔图案形成的表面和次表面层的旋转的强烈影响。
英文摘要：
We have observed with STM moiré patterns corresponding to the rotation of one graphene layer on HOPG surface. The moiré patterns were characterized by rotation angle and extension in the plane. Additionally, by identifying border domains and defects we can discriminate between moiré patterns due to rotation on the surface or subsurface layer. For a better understanding of moiré patterns formation we have studied by first principles an array of three graphene layers where the top or the middle layer appears rotated around the stacking axis. We compare the experimental and theoretical results and we show the strong influence of rotations both in surface and subsurface layers for moiré patterns formation in corresponding STM images.
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