La Trobe
1544583_Grubišić-Čabo,A_2024.pdf (1.6 MB)

Quasi-freestanding AA-stacked bilayer graphene induced by calcium intercalation of the graphene-silicon carbide interface

Download (1.6 MB)
journal contribution
posted on 2024-03-07, 04:44 authored by A Grubišić-Čabo, JC Kotsakidis, Y Yin, Anton TadichAnton Tadich, M Haldon, S Solari, John RileyJohn Riley, Eric HuwaldEric Huwald, KM Daniels, RL Myers-Ward, MT Edmonds, NV Medhekar, DK Gaskill, MS Fuhrer
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 calcium-terminated SiC, indicating a spontaneous transition from AB- to AA-stacked bilayer graphene following calcium intercalation of the underlying graphene-SiC interface.

Funding

This work was supported by the Australian Research Council under awards DP150103837, DP200101345 and FL120100038. JK was supported by the Australian Government Research Training Program, and the Monash Centre for Atomically Thin Materials. YY and NM were supported by the Australian Research Council (CE17010039). DG, RM-W, and KD were supported by core programs at the U.S. Naval Research Laboratory funded by the Office of Naval Research.

History

Publication Date

2023-02-05

Journal

Frontiers in Nanotechnology

Volume

5

Article Number

1333127

Pagination

8p.

Publisher

Frontiers Media S.A.

ISSN

2673-3013

Rights Statement

© 2024 Grubišić-Čabo, Kotsakidis, Yin, Tadich, Haldon, Solari, Riley, Huwald, Daniels, Myers-Ward, Edmonds, Medhekar, Gaskill and Fuhrer. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

Usage metrics

    Journal Articles

    Categories

    No categories selected

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC