SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Graphene I: Adsorption, Intercalation and Doping

O 82.6: Vortrag

Donnerstag, 30. März 2023, 16:15–16:30, GER 37

Atomic and electronic structure of intercalated Pb layers in proximity to epitaxial graphene — •Chitran Ghosal, Markus Gruschwitz, Julian Koch, and Christoph Tegenkamp — Institut für Physik, TU Chemnitz, Chemnitz, Germany

Selective intercalation into the buffer layer/SiC(0001) interface can realize atomically sharp interface layers near epitaxial graphene that resemble novel 2D heterosystems. High-Z elements are interesting candidates, not only because they are expected to host Dirac fermions, but also because spin effects are expected in graphene.

Intercalation of Pb leads to the formation of different phases, which we have studied in detail using scanning tunneling microscopy. As recently shown, intercalated Pb bilayers form nanostripes under graphene and show fingerprints of plumbene. These Pb layers are rotated with respect to graphene, which breaks the sublattice symmetry and is associated with an electronic gap in graphene [1]. Hexagonally arranged bubble-like structures with an average size of 2.3  nm were also found. Scanning tunneling spectroscopy (STS) again revealed the formation of mini-gaps in the 2D heterosystem. Spatially resolved mapping of the electronic structure also clearly showed the existence of a network of edge states around the edges of the bubbles.

[1] C. Ghosal et al., PRL 129, 116802 (2022)