Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Monday: 2D Materials 1
O 18.6: Poster
Monday, September 5, 2022, 18:00–20:00, P4
Vertical structure of Sb-intercalated quasi-freestanding graphene on SiC(0001) — You-Ron Lin1,2,3, Susanne Wolff4,5, •Mark Hutter1,2,3, Serguei Soubatch1,2, Tien-Lin Lee6, F. Stefan Tautz1,2,3, Thomas Seyller4,5, Christian Kumpf1,2,3, and François C. Bocquet1,2 — 1Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 2Jülich Aachen Research Alliance (JARA) — 3Experimentalphysik IV A, RWTH Aachen University, Germany — 4Institute of Physics, Faculty of Natural Sciences, TU Chemnitz, Germany — 5Center for Materials, Architectures and Integration of Nanomembranes (MAIN), TU Chemnitz, Germany — 6Diamond Light Source Ltd., Didcot, Oxfordshire, UK
Using the normal incidence x-ray standing wave (NIXSW) technique, we have investigated the vertical structure of quasi-freestanding monolayer graphene (QFMLG) obtained by intercalation of antimony under the (6 √3 x 6 √3) R30∘ reconstructed graphitized 6H-SiC(0001) surface, also known as zeroth-layer graphene. We found that Sb intercalation decouples the QFMLG very well from the substrate. The distance from the QFMLG to the Sb layer almost equals the expected van der Waals bonding distance of C and Sb. The Sb-intercalation layer itself is mono-atomic, very flat, and located much closer to the substrate, at almost the distance of a covalent Sb-Si bond length. All data is consistent with Sb located on-top of the uppermost Si atoms of the SiC bulk.