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MA: Fachverband Magnetismus

MA 46: Surface Magnetism

MA 46.5: Vortrag

Freitag, 21. März 2025, 10:30–10:45, H19

Excitons design via topological spin-textures — •Karim Rezouali^1,2 and Samir Lounis^2,1 — ¹Faculty of Physics, University of Duisburg-Essen and CENIDE, 47053 Duisburg, Germany — ²Peter Grünberg Institut, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany

Excitons are at the heart of many photonic and optoelectronic phenomena, including luminescence, lasing, and the operation of solar cells. Their study is essential for developing next-generation technologies, such as light-harvesting systems and quantum information devices. Here, we explore the impact of topological magnetism [1] on excitons by unveiling signatures of topology on the magnetic properties of excitons, their stability and manipulation. We address in particular skyrmions emerging in Pd/Fe/Ir(111) [2] surface, which affect the singlet and triplet exciton states hosted by a monolayer MoS₂ [3]. Our work promotes the use of skyrmions for the control and manipulation of excitons, which provides unprecedented opportunities for exciton-based devices.
[1] M. V. Berry, Proc. R. Soc. Lond. A 392, 45 (1984).

[2] N. Romming, A. Kubetzka, C. Hanneken, K. von Bergmann, and
R. Wiesendanger, Phys. Rev. Lett. 114, 177203 (2015)

[3] M. Palummo, M. Bernardi, and J. C. Grossman,
Nano Letters 15, 2794 (2015).
– Project funded by DFG (SPP 2137: LO 1659/8-1).

Keywords: Skyrmions; Wannier excitons; Berry phase; Emergent magnetic field; Surface