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16 April 2024

» arxiv » 1501.4872

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Competing scanning tunneling microscope tip-interlayer interactions for twisted multilayer graphene on the a-plane SiC surface
P. Xu ; M.L. Ackerman ; S.D. Barber ; J.K. Schoelz ; P.M. Thibado ; V.D. Wheeler ; L.O. Nyakiti ; R.L. Myers-Ward ; C.R. Eddy Jr. ; D.K. Gaskill ;
Date:	20 Jan 2015
Abstract:	Scanning tunneling microscopy (STM) images are obtained for the first time on few layer and twisted multilayer epitaxial graphene states synthesized on n+ 6H-SiC a-plane non-polar surface. The twisted graphene is determined to have a rotation angle of 5.4{deg} between the top two layers, by comparing moir’e patterns from stick and ball models of bilayer graphene to experimentally obtained images. Furthermore, the experimental moir’e pattern shows dynamic behavior, continuously shuffling between two stable surface arrangements one bond length apart. The moir’e pattern shifts by more than 1 nm, making it easy to observe with STM. Explanation of this dynamic behavior is attributed to electrostatic interactions between the STM tip and the graphene sample.
Source:	arXiv, 1501.4872
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