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O: Fachverband Oberflächenphysik

O 86: Electronic Structure of Surfaces: Spectroscopy, Surface States II

O 86.2: Vortrag

Donnerstag, 20. März 2025, 15:15–15:30, H2

Tunneling Spectroscopy of RuO₂(110): Electronic Structure, Correlation Effects and Substrate Interactions — •Philipp Keßler, Andreas Feuerpfeil, Hendrik Hohmann, Matteo Dürrnagel, Armando Consiglio, Jonas Erhardt, Michael Sing, Ralph Claessen, Ronny Thomale, and Simon Moser — Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany

The (110) surface of RuO₂ hosts a flat band surface state (FBSS) close to the Fermi level that is prone to Fermi surface instabilities and can be readily observed in angle resolved photoemission. A local spectroscopic investigation of this FBSS to study such instabilities is, however, still outstanding. In this talk, we present the synthesis of high quality RuO₂(110) surfaces, enabling systematic scanning tunneling spectroscopy (STS) measurements across wide defect free domains. We observe hints of correlation effects, manifesting in signatures of a charge density wave and a zero-bias anomaly. Furthermore, we offer preliminary evidence suggesting that the electronic structure of RuO₂ depends on the oxide film thickness and immediate screening environment within the substrate. These findings illuminate the interplay between the Ru metal substrate and the RuO₂ oxide, advancing this topical material.

Keywords: spectroscopy; ruthenium dioxide; synthesis; correlation; scanning tunneling microscopy