Book/Dissertation / PhD Thesis

FZJ-2026-02332

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Towards high-quality decoupled Graphene heterostructures

Hutter, M. (Corresponding author)FZJ*

2026
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-913-8

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Please use a persistent id in citations: doi:10.34734/FZJ-2026-02332

Abstract: This thesis deals with the 2D material graphene, which has been the subject of intense research in recent years due to its unique properties. The main focus is on different ways to tune the properties of graphene. Several approaches to modify the properties of graphene are investigated, focusing on intercalation and twisted bilayer structures. The intercalation with Bi and Se is studied using the Normal Incidence X-ray Standing Wave (NIXSW) technique, which reveals the vertical structure of these systems, from which some electronic properties can be deduced. For the intercalation with Bi, the two phases (αand β ) are discussed. For all samples, the results show a successful decoupling of the graphene from the substrate (SiC(0001)), with van-der-Waals bond distances of Bi and Se to graphene and covalent bond distances to the substrate. Epitaxially grown samples are also discussed for twisted bilayer graphene. Two 30° twisted bilayer graphene samples are grown using the surfactant-mediated growth technique presented by Bocquet [1] and are investigated with respect to the different annealing temperatures during the growth. A temperature difference of only 50 K results in a very different structure and thickness of the graphene layers. Besides the epitaxial growth, twisted bilayer graphene is also prepared by exfoliation and stacking for scanning tunneling microscopy (STM) and transmission electron microscopy (TEM) investigations. A sample with a twist angle of 1.2° reveals in STM the shift of van Hove singularities and the possibility of doping the sample through the STM tip. For TEM, different transfer methods are investigated, including the use of different polymer stamps and different TEM grids (Cu grid, sapphire glass, and SiN wafer). Despite progress in the sample preparation, further studies are needed to find a suitable transfer method and to realize the TEM investigations of twisted bilayer graphene.

Note: Dissertation, RWTH Aachen University, 2026

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Contributing Institute(s):

1. Quantum Nanoscience (PGI-3)

Research Program(s):

1. 5213 - Quantum Nanoscience (POF4-521) (POF4-521)

Appears in the scientific report 2026

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