Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: 2D semiconductors VII – CrSBr and related heterostructures
HL 39.6: Vortrag
Donnerstag, 12. März 2026, 10:45–11:00, POT/0081
Evidence for a novel spin-density excitation in 2D magnetic semiconductor CrSBr — •Pierre-Maurice Piel1, Jan-Hendrik Larusch1, Aleksandra Łopion1, 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 magnet CrSBr is an air-stable semiconductor with ferromagnetic layers, antiferromagnetic interlayer coupling, and a highly anisotropic bandstructure, resulting in quasi-one-dimensional excitonic states [1]. We probe the impact of magnetic order on excitons and collective modes using low temperature (4K) magneto photoluminescence and resonant Raman spectroscopy with special emphasize on the magnetic anisotropy and magnetic phase transitions. The excitonic signatures in photoluminesence show clear differences between antiferromagnetic and ferromagnetic regimes and reveal pronounced magnetic anisotropy. In resonant Raman, the first order Ag phonons remain essentially field independent, whereas additional modes appear only under excitonic resonance. We resolve a sharp mode near 248 cm-1 emerging in resonance with the A-exciton (~1.36eV) and a broad mode at 362 cm-1 occurring in A and higher-lying excitonic regimes. The mode's excitation energy and field dependence indicate selective access to different collective possibly spin-density excitations in CrSBr. [1] J. Klein et al., ACS Nano 17, 5316-5328 (2023).
Keywords: magnetic; semiconductor; anisotropic; CrSBr; optics