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The role of two-dimensional pressure in sulfur intercalation underneath graphene on ruthenium

  • Micrometer-sized single-layer graphene can epitaxially be grown on transition-metal substrates with excellent crystalline quality. However, due to strong binding these substrates have a detrimental influence on the intrinsic properties of the graphene. By lifting the interlayer coupling, e. g., via intercalating foreign atoms, its unique electronic properties can be restored. We have investigated the intercalation of sulfur underneath graphene on Ru(0001) with low-energy electron microscopy (LEEM) and micro-diffraction (µLEED). We find that sulfur deposited at elevated temperatures enters through the edge of the island, leading to wrinkle formation in the decoupled graphene. Interestingly, the presence of the graphene limits the possible S/Ru(0001) reconstructions that may form underneath, preventing less dense reconstructions like the p(2× 2) and (√3× √3) reconstructions. Based on density functional theory calculations, these findings are explained by a 2D pressure exerted by the overlying graphene, which results from the strongMicrometer-sized single-layer graphene can epitaxially be grown on transition-metal substrates with excellent crystalline quality. However, due to strong binding these substrates have a detrimental influence on the intrinsic properties of the graphene. By lifting the interlayer coupling, e. g., via intercalating foreign atoms, its unique electronic properties can be restored. We have investigated the intercalation of sulfur underneath graphene on Ru(0001) with low-energy electron microscopy (LEEM) and micro-diffraction (µLEED). We find that sulfur deposited at elevated temperatures enters through the edge of the island, leading to wrinkle formation in the decoupled graphene. Interestingly, the presence of the graphene limits the possible S/Ru(0001) reconstructions that may form underneath, preventing less dense reconstructions like the p(2× 2) and (√3× √3) reconstructions. Based on density functional theory calculations, these findings are explained by a 2D pressure exerted by the overlying graphene, which results from the strong graphene-substrate interaction, only rendering the denser reconstructions of the S/Ru phase diagram energetically favorable.show moreshow less

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Metadaten
Author: Lars BußORCiD, Jens FaltaORCiD, Moritz EwertORCiD, Bin Shao, Tim Oliver WehlingORCiD, Jan Ingo FlegeORCiD
URL:https://www.dpg-verhandlungen.de/year/2021/conference/surfacescience/part/o/session/105/contribution/3
Title of the source (English):Verhandlungen der DPG - SurfaceScience21
Publisher:Deutsche Physikalische Gesellschaft e.V.
Place of publication:Bad Honnef
Document Type:Image (poster)
Language:English
Year of publication:2021
Tag:Low energy elecron microscopy (LEEM); Low energy electron diffraction LEED; graphene; ruthenium; sulfur intercalation
Volume/Year:2021
Article number:O 105.3
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Angewandte Physik und Halbleiterspektroskopie
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