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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Approaching truly freestanding graphene: the structure of hydrogen-intercalated graphene on 6H−SiC(0001) J. Sforzini , L. Nemec , T. Denig , B. Stadtmüller , T. L Lee , C. Kumpf , S. Soubatch , U. Starke , P. Rinke , V. Blum , F. Bocquet , S. Tautz Physical Review Letters 114, 106804 DOI: 10.1103/PhysRevLett.114.106804 PMID: 25815955 Diamond Proposal Number(s): [8449, 10271] Open Access Show Abstract ▼ Abstract: We measure the adsorption height of hydrogen-intercalated quasifreestanding monolayer graphene on the (0001) face of 6H silicon carbide by the normal incidence x-ray standing wave technique. A density functional calculation for the full ð6 ffiffiffi 3 p × 6 ffiffiffi 3 p Þ-R30° unit cell, based on a van derWaals corrected exchange correlation functional, finds a purely physisorptive adsorption height in excellent agreement with experiments, a very low buckling of the graphene layer, a very homogeneous electron density at the interface, and the lowest known adsorption energy per atom for graphene on any substrate.Astructural comparison to other graphenes suggests that hydrogen-intercalated graphene on 6H-SiCð0001Þ approaches ideal graphene.	Mar 2015
I09-Surface and Interface Structural Analysis	Boron nitride on SiC(0001) You-Ron Lin , Markus Franke , Shayan Parhizkar , Miriam Raths , Victor Wen-Zhe Yu , Tien-Lin Lee , Serguei Soubatch , Volker Blum , F. Stefan Tautz , Christian Kumpf , Francois C. Bocquet Physical Review Materials 6 DOI: 10.1103/PhysRevMaterials.6.064002 Diamond Proposal Number(s): [17737] Show Abstract ▼ Abstract: In the field of van der Waals heterostructures, the twist angle between stacked two-dimensional layers has been identified to be of utmost importance for the properties of the heterostructures. In this context, we previously reported the growth of a single layer of unconventionally oriented epitaxial graphene that forms in a surfactant atmosphere [F. C. Bocquet et al., Phys. Rev. Lett. 125, 106102 (2020)]. The resulting G- R 0 ∘ layer is aligned with the SiC lattice, and hence represents an important milestone towards high-quality twisted bilayer graphene, a frequently investigated model system in this field. Here, we focus on the surface structures obtained in the same surfactant atmosphere, but at lower preparation temperatures at which a boron nitride template layer forms on SiC(0001). In a comprehensive study based on complementary experimental and theoretical techniques, we find—in contrast to the literature—that this template layer is a hexagonal B x N y layer, but not high-quality hBN. It is aligned with the SiC lattice and gradually replaced by low-quality graphene in the 0 ∘ orientation of the B x N y template layer upon annealing.	Jun 2022

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