Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.33: Poster

Tuesday, March 18, 2025, 18:00–20:00, P1

Tuning of non-radiative decay channels in CrSBr by a magnetic phase transition — •Fabian Glatz¹, Minjiang Dan^1,2, Till Weickhardt¹, Zdeněk Sofer³, Marie-Christin Heißenbüttel⁴, Julian Klein⁵, and Giancarlo Soavi^1,6 — ¹Friedrich Schiller University Jena, Germany — ²Southwest University of Science and Technology, Mianyang, China — ³University of Chemistry and Technology Prague, Czech Republic — ⁴Westfälische Wilhelms-Universität Münster, Germany — ⁵Massachusetts Institute of Technology, USA — ⁶Abbe Center of Photonics, Jena, Germany

CrSBr is a layered magnetic semiconductor with a direct bandgap [1]. Magnetic measurements have shown that below the Néel temperature (132 K) the spins within a single layer arrange ferromagnetically, while multiple layers couple antiferromagnetically (AFM) [2]. Here, we investigate the evolution of CrSBr under a magnetic phase transition by using nonlinear optics. In agreement with existing literature, second harmonic generation (SHG) becomes allowed due to the symmetry-breaking by AFM ordering at low temperatures [3]. Additionally, this phase change from paramagnetic (PM) to AFM leads to a change in the band structure that enhances third harmonic generation (THG) at the lowest energy optical resonance while quenching the photoluminescence quantum yield. This indicates the opening of a phonon mediated non-radiative decay channel upon transition from PM to AFM phase.

[1] Wang et al., Nat. Commun. 14, 5966 (2023). [2] Telford et al., Adv. Mater. 32, 2003240 (2020). [3] Lee et al., Nano Lett. 21, 3511-3517 (2021).

Keywords: Nonlinear Optics; Antiferromagnetic phase change; CrSBr