Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Topology and Symmetry Protected Materials (joint session O/TT)
TT 55.1: Talk
Wednesday, March 20, 2024, 15:00–15:15, HL 001
Interaction Effects in a 1D Flat Band at a Topological Crystalline Step Edge — •Souvik Das1, Glenn Wagner2, Johannes Jung3, Artem Odobesko3, Felix Kuester1, Florian Keller3, Jedrzej Korczak4, Andrzej Szczerbakow5, Tomasz Story4, Ronny Thomale6, Titus Neupert2, Matthias Bode3, Paolo Sessi1, and Stuart S. P. Parkin1 — 1Max Planck Institute of Microstructure Physics, Halle 06120,Germany — 2Department of Physics, University of Zürich, 8057 Zürich, Switzerland — 3Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, 97074 Würzburg, Germany — 4Institute of Physics and International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland — 5Institute of Physics, Polish Academy of Sciences, 02-668 Warsaw, Poland — 6Institut für Theoretische Physik und Astrophysik Universität Würzburg, 97074 Würzburg, Germany
We utilize scanning tunneling microscopy and spectroscopy to explore the behavior of the 1D step-edge channels in PbSnSe, a topological crystalline insulator, under the influence of doping. By doping distinct 3d adatoms in PbSnSe we observed that once the energy position of the step edge is brought close to the Fermi level, a new correlation gap starts to open. Our experimental findings are rationalized in terms of enhanced interaction effects since the electron density of states condenses into a 1D channel. This enables us to realize a unique system to study how topology and many-body electronic effects intertwine.
Keywords: topological crystalline insulators; strong correlations in flat bands; topological edge states; scanning tunneling microscopy