Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Physics of the van der Waals Magnetic Semiconductor CrSBr II (joint session HL/MA)

HL 60.3: Hauptvortrag

Freitag, 21. März 2025, 10:30–11:00, H17

A theoretical perspective on exciton-magnon coupling and its implications — •Akashdeep Kamra — Department of Physics, Rheinland-Pfälzische Technische Universität (RPTU) Kaiserslautern-Landau, Kaiserslautern, Germany

The dependence of exciton energies on the magnetic order in CrSBr has opened avenues for controlling optical properties using magnetic fields. Conversely, it has enabled an optical time-resolved sensing of the magnetic degrees of freedom. This has further been exploited to investigate the interplay between excitons and magnons, the excitations of the magnetic order. We will discuss how excitonic energies offer a convenient access to coherent as well as thermal magnon dynamics. Focusing on transport, we will discuss the recent observation of the magnon-exciton drag effect that makes it feasible to leverage thermal magnon currents for transporting excitons at unexpectedly fast velocities. Finally, we will conclude with a brief discussion of emergent non-linearities in exciton energies mediated by the magnonic modes in the canted magnetic state of CrSBr.

References:

1. F. Dirnberger et al., Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons, Nature 620, 533 (2023).

2. F. Dirnberger, S. Terres, Z. A. Iakovlev, K. Mosina, Z. Sofer, A. Kamra, M. M. Glazov, and A. Chernikov, Exciton transport driven by spin excitations in an antiferromagnet (unpublished).

3. B. Datta et al., Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet, arXiv:2409.18501.

Keywords: Magnons; Excitons; Van der Waals magnets