Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 22: 2D Materials 8 (joint session DS/CPP)
DS 22.2: Vortrag
Donnerstag, 8. September 2022, 09:45–10:00, H17
Light-Matter Interaction in 2D Polar Metals — Margaux Lassaunière1, Wen He2, Katharina Nisi1, Shruti Subramanian3, Siavash Rajabpour3, Alexander Vera3, Nathalie Briggs3, Su Ying Quek2, Joshua Robinson3, Ursula Wurstbauer1, and •Pierre Piel1 — 1Institut of Physics, Münster University, Germany — 2Department of Physics, National University of Singapore, Singapore — 3MatSE; Center for 2DLM; ATOMIC; 2D Crystal Consort.; Penn State University, USA
Understanding and controlling the light-matter interaction in thin metal films is of high technological relevance. Here, we study the linear optical response of atomically thin 2D gallium, 2D indium as well as their alloys embedded in half-van der Waals heterostructures by spectroscopic imaging ellipsometry. The thin films are prepared via confinement heteroepitaxy (Chet). In a systematic study of the dielectric functions, we separate free and bound electron contributions to the optical response, with the latter pointing towards the existence of thickness-dependent quantum confinement phenomena and epsilon near zero (ENZ) behaviour [1]. The resonance energies of the observed ENZ behaviour are dependent on the number of atomic metal layers, materials, and alloying [2]. Their tunability makes 2D polar metals attractive for quantum engineered metal films, tunable (quantum-)plasmonics and nano-photonics.
[1] K. Nisi et al. Adv. Mater. 2021, 2104265
[2] S. Rajabpour et al. Adv. Funct. Mater. 2020, 2005977