Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 74: Graphene: Electronic structure, excitations, etc. – Poster (joint session O/TT)

O 74.4: Poster

Mittwoch, 11. März 2026, 18:00–20:00, P2

Enhanced Screening in Indium Intercalated Graphene Enabled by 2D Nearly Free Electron States — •Lukas Gehrig^1,2, Cedric Schmitt^1,2, Kilian Strauß^1,2, Jonas Erhardt^1,2, Stefan Enzner^2,3, Martin Kamp^1,4, Timur Kim⁵, Giorgio Sangiovanni^2,3, Jörg Schäfer^1,2, Simon Moser⁶, and Ralph Claessen^1,2 — ¹Physikalisches Institut, Universität Würzburg, Germany — ²Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Germany — ³Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany — ⁴Röntgen Center for Complex Material Systems, Würzburg, Germany — ⁵Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom — ⁶Experimentalphysik IV - AG Oberflächen, Ruhr-Universität Bochum, Germany

Intercalation of epitaxial graphene on SiC has been intensively explored to modify graphene’s electronic properties, but previous intercalants provide only weak screening, leading to pronounced electron-plasmon coupling and the appearance of plasmaron bands in ARPES [1]. Here, we demonstrate that intercalated bilayer indium exhibits strongly Rashba-split bands, which acquire nearly free-electron-like character at the Fermi level. This induces exceptionally strong screening in graphene, significantly reducing many-body renormalization effects in the graphene bands, which arise from plasmaron coupling. This approach opens new opportunities to explore and control many-body interactions in graphene-based heterostructures.

[1] Bostwick A et al., Nat. Phys. 3, 36-40 (2007)

Keywords: Graphene; Bilayer Indium; Rashba splitting; Many-body renormalization; Ultrathin quantum materials