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HL: Fachverband Halbleiterphysik

HL 22: 2D Materials IV (joint session HL/CPP)

HL 22.8: Talk

Wednesday, March 29, 2023, 11:45–12:00, POT 81

The influence of anisotropy on excitons in magnetic semiconductors — •Marie-Christin Heißenbüttel, Thorsten Deilmann, and Michael Rohlfing — Institute of Solid State Theory, University of Münster, Germany

Understanding the peculiar interrelation between crystal structure, magnetic properties and light-matter interaction in semiconducting two-dimensional-like magnets is of fundamental interest. From our ab-initio GW/Bethe-Salpeter equation calculations, we are able to examine electronic and excitonic properties on the same footing.

Because of its large crystal anisotropy combined with in-plane ferromagnetism, the van-der-Waals stacked CrSBr has recently come to the fore e.g. to study correlated phenomena. Due to the unique interplay of anisotropy, two-dimensional magnetism and optoelectronic properties resulting in a quantum confinement, we observe very flat dispersions, different effective masses and a quasi-1D behaviour of excitons within a monolayer of CrSBr [1]. Moreover, we find that the Rydberg series of two excitonic states is intricately modified by the different extension of the wavefunctions within momentum space.

[1] https://arxiv.org/abs/2205.13456