Moiré patterns on STM images of graphite from surface and subsurface rotated layer

Details Moiré patterns on STM images of graphite from surface and subsurface rotated layer Moiré patterns on STM images of graphite from surface and subsurface rotated layer

2012-02-07

arxiv.org/abs/1202.1344v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 7 figures

Scientific paper

We have observed with STM moir\'e patterns corresponding to the rotation of one graphene layer on HOPG surfaces. The moir\'e pattern domains were characterized by rotation angle and extension in the plane. Additionally, by identifying the border domain and defects we can discriminate between moir\'e patterns due to rotation on the surface or subsurface layers. For a better understanding of moir\'e pattern formation we have studied, from a theoretical point of view, an array of three graphene layers where the top or middle layer appears rotated around the stacking axis. By applying first-principles total-energy electronic structure calculations to this array we obtain the spatial charge density and its corresponding STM image. We compare the experimental and theoretical results and show the strong influence of rotations both in surface and subsurface layers for moir\'e pattern formations in HOPG STM images.

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