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HL: Fachverband Halbleiterphysik
HL 39: 2D semiconductors VII – CrSBr and related heterostructures
HL 39.5: Vortrag
Donnerstag, 12. März 2026, 10:30–10:45, POT/0081
Coupling Between Vibrational, Electronic, and Magnetic States in CrSBr — •Daria Markina1, Priyanka Mondal1, Lukas Krelle1, Sai Shradha1, Mikhail M. Glazov2, Regine von Klitzing1, Kseniia Mosina3, Zdenek Sofer3, and Bernhard Urbaszek1 — 1Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 6-8, D-64289 Darmstadt, Germany — 2St. Petersburg, Russia — 3Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
The van der Waals antiferromagnet CrSBr displays interplay between vibrational, electronic, and magnetic states, producing distinctive quasiparticle interactions. Using temperature-dependent polarization-resolved Raman spectroscopy with optical absorption and photoluminescence excitation (PLE), we examine these effects across the magnetic phase transition. Under 1.96 eV excitation, the Ag1, Ag2, and Ag3 Raman modes exhibit pronounced polarization and intensity changes near the Néel temperature, accompanied by modifications in excitonic oscillator strength and resonant PLE features. The distinct temperature evolution of Raman tensor elements indicates that individual phonons couple to specific excitonic and electronic states. The suppression of excitonic transitions above the Néel temperature links these effects to spin alignment, suggesting an indirect spin−phonon interaction mediated by exciton−phonon coupling. These findings establish CrSBr as a promising platform for studying quasiparticles in two-dimensional magnets and for potential quantum technologies.
Keywords: CrSBr; Raman spectroscopy; spin-phonon coupling