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Bibliographic Details
Main Authors:	Grubišić-Čabo, Antonija, Kotsakidis, Jimmy C., Yin, Yuefeng, Tadich, Anton, Haldon, Matthew, Solari, Sean, Riley, John, Huwald, Eric, Daniels, Kevin M., Myers-Ward, Rachael L., Edmonds, Mark T., Medhekar, Nikhil, Gaskill, D. Kurt, Fuhrer, Michael S.
Format:	Preprint
Published:	2023
Subjects:	Materials Science
Online Access:	https://arxiv.org/abs/2311.02528
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We study quasi-freestanding bilayer graphene on silicon carbide intercalated by calcium. The intercalation, and subsequent changes to the system, were investigated by low-energy electron diffraction, angle-resolved photoemission spectroscopy (ARPES) and density-functional theory (DFT). Calcium is found to intercalate only at the graphene-SiC interface, completely displacing the hydrogen terminating SiC. As a consequence, the system becomes highly n-doped. Comparison to DFT calculations shows that the band dispersion, as determined by ARPES, deviates from the band structure expected for Bernal-stacked bilayer graphene. Instead, the electronic structure closely matches AA-stacked bilayer graphene on Ca-terminated SiC, indicating a spontaneous transition from AB- to AA-stacked bilayer graphene following calcium intercalation of the underlying graphene-SiC interface.

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