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HL: Fachverband Halbleiterphysik

HL 59: 2D Semiconductors and van der Waals Heterostructures VI

HL 59.1: Vortrag

Freitag, 21. März 2025, 09:30–09:45, H15

Interlayer excitons in electric and magnetic fields — •Thorsten Deilmann — Institute of Solid State Theory, University of Münster, Germany

Over the past years, more and more two-dimensional (2D) materials have been stacked to heterostructures. Due to the coupling interlayer excitations can form.

Here we report on a trilayer heterostructure of MoS₂ and WS₂. In contrast to bilayers, the coupling may lead to quadrupolar excitons. These can be clearly identified by the quadratic response of the corresponding excitons in our GW/BSE calculations in electric fields. In the second example, we report our studies of bulk CrSBr [1]. In a magnetic field the lowest bright excitations of the antiferromagnetically coupled CrSBr shift quadratically. Our calculations reveal the symmetry forbidden dark excitons and the increasing interlayer character. We develop a minimal model to explains this spin-dependent coupling. Despite its simplicity, the proposed model is generally applicable to any coupled 2D magnet.

[1] https://arxiv.org/abs/2403.20174

Keywords: heterostructures; interlayer exciton