Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Poster Graphene: Electronic Structure and Excitations
O 33.21: Poster
Dienstag, 18. März 2025, 13:30–15:30, P3
Hexagons on Rectangles: Epitaxial Graphene on Ru(1010) — •Lars Buß1, Giovanni Zamborlini2, Cathy Sulaiman1, Moritz Ewert1, Mirko Cinchetti2, Jens Falta3, and Jan Ingo Flege1 — 1Applied Physics and Semiconductor Spectroscopy, BTU Cottbus-Senftenberg, Germany — 2Department of Physics, TU Dortmund University, Germany — 3Institute of Solid State Physics, University of Bremen, Germany
The miniaturization of integrated electronics drives the demand for barrierless interconnects, with graphene-ruthenium structures emerging as promising candidates. We present an in situ study of the growth and electronic properties of graphene on rectangular Ru(1010) grown by high-temperature carbon segregation. Using low-energy electron microscopy (LEEM), it is shown that graphene grows preferentially along the [1210] direction, forming micrometer-sized rectangular islands. Microspot low-energy electron diffraction (µLEED) reveals two predominant graphene orientations, rotated by 0∘ (R0) and 30∘ (R30), with indications for the formation of graphene nanoribbons in bilayer graphene/Ru(1010). Microspot angle-resolved photoemission spectroscopy (µARPES) shows that the Dirac cones remain intact in bilayer graphene with reduced n-type doping compared to graphene/Ru(0001), indicating a weaker interaction with the Ru(1010) surface. These results highlight the influence of substrate symmetry and interactions on graphene properties and provide insights for engineering graphene beyond hexagonal substrates.
Keywords: Graphene; LEEM; ARPES; Ruthenium; Nanoribbons