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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.3: Poster

Mittwoch, 29. März 2023, 17:00–19:00, P1

Nonlinear optical processes in the layered magnetic semiconductor CrSBr — •Minjiang Dan¹, Paul Herrmann¹, Julian Klein², Zdenek Sofer³, and Giancarlo Soavi¹ — ¹Institute of Solid State Physics, Friedrich Schiller University Jena, Jena, Germany — ²Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, USA — ³Department of Inorganic Chemistry, University of Chemistry and Technology Prague, 166 28 Prague 6, Czech Republic

CrSBr has recently emerged as a new member in the family of layered magnetic materials, with the distinct advantages compared to CrI3 of being stable in air and having a high Néel temperature in the bulk form. Recently polarization-resolved Second Harmonic Generation (SHG) has been employed to reveal the layer-dependent magnetic order and symmetry in multilayer CrSBr [1]. In this work, we use nonlinear optical spectroscopy, i.e. SHG and Third Harmonic Generation (THG) and two photon absorption, to investigate the electronic and excitonic resonances in few-layer and bulk CrSBr as a function of the lattice temperature which, modulates the magnetic properties of the material. Our results show large enhancement (>100) in the SHG and THG for specific wavelengths and range of temperatures, pointing towards the existence of resonances from the magnetic dipole response of the system. This sheds light on the excited state landscape of this new material and offers viable insights towards its application in spintronic, magnonic and opto-electronic devices.

[1] Lee et al., Nano Letters 21, 8, 3511-3517 (2021)