Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 40: 2D Materials and Heterostructures: Magnetic Properties
HL 40.2: Vortrag
Donnerstag, 21. März 2024, 09:45–10:00, EW 201
Magnetic anisotropy in excitonic resonances and exciton-phonon coupling of the 2D magnetic semiconductor CrSBr — •Pierre-Maurice Piel1, Nicolai-Leonid Bathen1, Zdenek Sofer2, and Ursula Wurstbauer1 — 1Institute of Physics, Muenster University, Germany — 2Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Prague, Czech Republic
The van der Waals material CrSBr comprises several intriguing characteristics: it is an optically active semiconductor and an air-stable 2D magnet with ferromagnetic ordering within each layer and antiferromagnetic coupling between adjacent layers. It has also a highly anisotropic electronic band structure, rendering it a quasi-one-dimensional electronic system [1]. In order to unravel the impact of magnetic order and magnetization direction on various aspects, including excitonic interband transitions, exciton-phonon coupling, and collective excitations, we employ magnetic field-dependent photoluminescence and resonant Raman experiments at low temperatures, around 4 Kelvin, well below the Néel temperature. We observe distinct differences for anti-ferromagnetic and ferromagnetic order in in the excitonic signatures from PL measurements and in resonant Raman spectra, both showing magnetic anisotropy for different crystallographic orientations. While the Raman-allowed first order phonon modes are unaffected by magnetization direction, new and well resolved magnetic-field dependent modes occur in the resonant-Raman spectra indicating strong exciton-phonon coupling. [1] J. Klein et al. ACS Nano, 17, 5316-5328 (2023)
Keywords: magnetic; semiconductor; anisotropic; CrSBr; Optics