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001     1032607
005     20241125211005.0
024 7 _ |a 10.34734/FZJ-2024-06375
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037 _ _ |a FZJ-2024-06375
100 1 _ |a Yin, Hao
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245 _ _ |a Epitaxial growth of mono- and (twisted) multilayer graphene on SiC(0001)
260 _ _ |c 2024
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520 _ _ |a To take full advantage of twisted bilayers of graphene or other two-dimensional materials, it is essential to precisely control the twist angle between the stacked layers, as this parameter determines the properties of the heterostructure. In this context, a growth routine using borazine as a surfactant molecule on SiC(0001) surfaces has been reported, leading to the formation of high-quality epitaxial graphene layers that are unconventionally oriented, i.e., aligned with the substrate lattice (G-R0∘) [Bocquet et al. Phys. Rev. Lett. 125, 106102 (2020)]. Since the G-R0∘ layer sits on a buffer layer, also known as zeroth-layer graphene (ZLG), which is rotated 30∘ with respect to the SiC substrate and still covalently bonded to it, decoupling the ZLG-R30∘ from the substrate can lead to high-quality twisted bilayer graphene (tBLG). Here we report the decoupling of ZLG-R30∘ by increasing the temperature during annealing in a borazine atmosphere. While this converts ZLG-R30∘ to G-R30∘ and thus produces tBLG, the growth process at elevated temperature is no longer self-limiting, so that the surface is covered by a patchwork of graphene multilayers of different thicknesses. We find a 20% coverage of tBLG on ZLG, while on the rest of the surface tBLG sits on one or more additional graphene layers. In order to achieve complete coverage with tBLG only, alternative ways of decoupling the ZLG, e.g., by intercalation with suitable atoms, may be advantageous.
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700 1 _ |a Hutter, Mark
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700 1 _ |a Wagner, Christian
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700 1 _ |a Tautz, Frank Stefan
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700 1 _ |a Bocquet, Francois C
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700 1 _ |a Kumpf, Christian
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856 4 _ |u https://arxiv.org/abs/2411.11684
856 4 _ |u https://juser.fz-juelich.de/record/1032607/files/Yin%20et%20al%20tBLG%20%2B%20multilayers%20LEEM%20arXiv%202411.11684v1.pdf
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