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 Wurstbauer1 — 1Institute 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)