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HL: Fachverband Halbleiterphysik
HL 40: 2D Semiconductors and van der Waals Heterostructures IV
HL 40.1: Vortrag
Mittwoch, 19. März 2025, 15:30–15:45, H15
Dielectric tensor of the layered magnetic semiconductor CrSBr — •Pierre-Maurice Piel1, Sebastian Schaper1, Marie-Christin Heißenbüttel1, Aleksandra Lopion1, Zdenek Sofer2, and Ursula Wurstbauer1 — 1Institute of Physics, Muenster University, Germany — 2Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Prague, Czech Republic
Two-dimensional materials exhibit unique properties due to their atomically thin structure and weak van der Waals (vdW) coupling between layers resulting in layer dependent properties. As in the case of the layered magnetic semiconductor CrSBr, individual layers are ferromagnetically ordered below the Neel temperature (TN= 132K), while adjacent layers are coupled antiferromagnetically. Due to the highly anisotropic electronic bands in CrSBr, electronic and excitonic states at the fundamental band-gap behave quasi-one-dimensional [1]. To develop a better understanding of the extraordinary light-matter interaction in CrSBr, we access the materials dielectric tensor in the paramagnetic phase by spectroscopic imaging ellipsometry that is hard to access by alternative approaches such as reflectance measurements due to the strong anisotropy. In agreement with theory, we extract highly anisotropic dielectric functions along the crystallographic main axes with strong excitonic resonances particularly in the plane. [1] J. Klein et al. ACS Nano, 17, 6, 5316-5328 (2023).
Keywords: magnetic; semiconductor; dielectric function; CrSBr; ellipsometry