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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.22: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Optical Properties of He+-Irradiated CrSBr — •Alison Pfister1, Daria Markina1, Shengqiang Zhou2, Regine von Klitzing1, Kseniia Mosina3, Zdenek Sofer3, and Bernhard Urbaszek1 — 1Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 6-8, D-64289 Darmstadt, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany — 3Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
CrSBr, a van der Waals layered magnet, exhibits rich interactions among quasiparticles, involving photons, excitons, and spins. Although antiferromagnetic in its bulk pristine form with ferromagnetic intralayer order, irradiation with He+ ions drives CrSBr into a ferromagnetic state, enabling novel optical behaviour without applying an external magnetic field. We probe the optical response using polarization-resolved Raman spectroscopy together with absorption and photoluminescence excitation (PLE) measurements. Pronounced changes in Raman intensity and polarization alongside marked variations in absorption near the Curie temperature, and resonant features in PLE spectra were observed. Analysis of Raman tensor evolution and anomalous temperature-dependent behaviour of excitons in absorption highlights intricate coupling between lattice, electronic, and magnetic states, positioning CrSBr as an attractive platform for exploring quasiparticle physics in 2D magnets and related quantum technologies.
Keywords: CrSBr; 2D magnets; 2D semiconductor; Ion irradiation; Induced ferromagnetism