Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Poster: Proximity Effects in Epitaxial Graphene
O 30.3: Poster
Dienstag, 19. März 2024, 12:30–14:30, Poster A
Growth and structure of two-dimensional Pb-Layers below Epitaxial Graphene on SiC(0001) — •Peter Richter1,2, Franziska Schölzel1,2, Philip Schädlich1,2, and Thomas Seyller1,2 — 1Technische Universität Chemnitz, Institut für Physik, Chemnitz, 09126 Chemnitz — 2Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), 09126 Chemnitz
The intercalation of epitaxial graphene (EG) on SiC with various elements has widely been utilized to tailor the electronic properties of the graphene sheet. The ability of elements with strong spin-orbit coupling or even superconducting phases to induce this behavior into the graphene, moves heavy atoms such as Pb into the spotlight [1]. Beyond that, intercalation enables the manufacturing of otherwise unstable 2D-materials and protect it against oxidation.
We investigated the intercalation of EG with Pb in real time by means of Low Energy Electron Microscopy (LEEM), unraveling a strong temperature dependence. Interestingly, intercalation at lower temperatures results in a new phase of the intercalated Pb-layer contrasting the already reported striped- and bubble-phase [2]. Angle-resolved photoemission spectroscopy (ARPES) and low energy electron diffraction (LEED) investigations suggest a strict (1×1) periodicity. Moreover, we studied the phase transition from (1×1) Pb-phase to ’bubble’-phase occurring at 600 ∘C by X-Ray photoelectron spectroscopy (XPS), thus connecting our intercalation recipe to earlier reports. [1] N.B. Kopnin et al., Phys. Rev. B, 064524, 84 (2011) [2] M.Gruschwitz et al., Materials, 7706, 14 (2021)
Keywords: graphene; proximity; superconductivity; intercalation; 2D-Materials