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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.1: Poster

Donnerstag, 12. März 2026, 15:00–17:00, P4

Coupling between spin waves and excitons in CrSBr bilayers — •Luis Rolf Gieselmann, Thorsten Deilmann, and Michael Rohlfing — Institute of Solid State Theory, University of Münster, Germany

CrSBr is a layered van der Waals semiconductor characterized by its peculiar magnetic structure, possessing ferromagnetic ordering within and antiferromagnetic ordering between its layers.

The antiparallel alignment of spins in neighboring layers directly affects the excitonic properties of the material, as interlayer transitions of electrons and holes are thus optically forbidden in the magnetic ground state. External manipulation of the spins, however, produces partially parallel alignments between layers and thus enables excitations of interlayer excitons.

Such excitonic effects have previously been studied for canting by an external magnetic field. In our work, we have considered an alternative, namely canting of the spins induced by spin waves within CrSBr bilayers. The spin wave behavior of the material is studied using coherent states and then employed in a simple model Hamiltonian to calculate the change of excitonic energies.

Keywords: magnons; antiferromagnet; magnon-exciton interaction; 2D material; CrSBr