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Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 22: 2D Materials 8 (joint session DS/CPP)

DS 22.4: Talk

Thursday, September 8, 2022, 10:15–10:30, H17

Tracing the Superconducting Phase Transition in Atomically Thin 2D Polar Gallium by Transport and Spectroscopic Ellipsometry — •Jakob Henz1, Margaux Lassunière1, Pierre-Maurice Piel1, Siavash Rajabpour2, Alexander Vera2, Joshua Robinson2, and Ursula Wurstbauer11Institute of Physics, Muenster University, Germany — 2MatSE; Center for 2DLM; Atomic; 2D Crystal Consort, PennState University, USA

Half van der Waals 2D polar metals are a novel class of 2D materials, realized by confinement heteroepitaxial growth (CHet). Hereby, metal atoms such as gallium or indium are intercalated between graphene and a silicon carbide substrate. This results in large area, environmentally stable, 2D metals with a bonding gradient in z-direction ranging from covalent over metallic to vdW within only two to three atomic layers. The materials feature interesting properties such as superconductivity1 and a large plasmonic response in the visible range2. 2D gallium is studied by temperature dependent spectroscopic ellipsometry and transport measurements down to below 1K. We extract the dielectric function in the visible to near infrared range with a special focus on signatures across the phase transition from metallic to superconducting behavior unambiguously identified from the abrupt drop in the temperature dependent sheet resistance at the transition temperature TC of about 3.5 K.
1 S. Rajabpour et al., Adv. Mater. 2104265 (2021)
2 Nisi et al., Adv. Funct. Mater. 2005977, 1-11 (2020)

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