Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 29: Poster: 2D Materials
O 29.12: Poster
Dienstag, 19. März 2024, 12:30–14:30, Poster A
Characterization of single-layer NbSe2 — •Caroline Firschke1, Verena Caspari1, Jean-Maxime Schlachter2,3, Matthieu Jamet2,3, Clemens B. Winkelmann2,3, and Katharina J. Franke1 — 1Freie Universität Berlin, Germany — 2Université Grenoble Alpes, France — 3CEA Grenoble, France
A single layer of the superconductor NbSe2 exhibits different properties than its bulk counterpart due to its reduced dimensionality. For example, strong spin-orbit coupling combined with the lack of inversion symmetry locks electrons with opposite spin and momenta, resulting in an increased in-plane critical field.
Here, we use scanning tunneling microscopy (STM) at 1.1K to characterize single-layer NbSe2-islands on a bi-layer graphene on SiC, grown by molecular beam epitaxy. These samples had been capped with Se for transport from the growth chamber to the STM, which we remove by heating under ultra-high vacuum conditions. Although this procedure does not lead to atomically clean layers, we detect a superconducting gap and low-energy excitations outside of it, interpreted as Legget modes that are in agreement with the work by W. Wan et al. [1].
[1] Wen Wan et al. "Observation of Superconducting Collective Modes from Competing Pairing Instabilities in Single-Layer NbSe2". Adv. Mat. 34, 2206078 (2022)