Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 20: Poster
DS 20.39: Poster
Mittwoch, 7. September 2022, 16:00–18:00, P3
Cryogenic Transport And Dielectric Properties Of Atomically Thin 2D-Polar Metals — •Sven Bökemeier1, Pierre-Maurice Piel1, Jakob Henz1, Margaux Lassunière1, Joshua Robinson2, Siavash Rajabpour2, Alexander Vera2 und Ursula Wurstbauer1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Münster, — 2MatSE; Center for 2DLM; Atomic; 2D Crystal Consort, PennState University, USA
2D layered materials are of great interest due to their electronic and optical properties that can be manipulated to a high degree. A novel class of atomically thin materials are 2D polar metals such as 2D Ga or 2D In and their ternary alloys that exhibit fascinating properties like strong nonlinear optical properties emerging by giant second harmonic generation [1], epsilon near zero behavior in the visible and NIR range [2] and alloy dependent superconductivity [3]. Intriguingly, 2D Ga exhibits a superconducting phase transition around 4K, while 2D In remains a metal down to < 800mK [3]. The 2D polar metals are prepared via confinement hetero-epitaxy (CHet) by intercalating metals between epitaxial graphene and the hosting SiC crystal resulting in atomically thin half-van der Waals materials [1]. We report on combined temperature dependent transport and spectroscopic ellipsometry experiments in order to a develop a better understanding of the alloy dependent emerging superconductivity of thin 2D Ga and 2D GaIn films. [1] M. A. Steves et al. Nano Lett. 2020, 20, 11, 8312*8318. [2] K. Nisi et al. Adv. Mater. 2021, 2104265 [3] S. Rajabpour et al. Adv. Funct. Mater. 2020, 2005977