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HL: Fachverband Halbleiterphysik

HL 54: 2D Materials IX – Photonic properties and devices

HL 54.8: Vortrag

Freitag, 13. März 2026, 11:30–11:45, POT/0081

Cavity polaritons in a hybrid van-der-Waals superconductor-semiconductor structure — •Seyma Esra Atalay, Hangyong Shan, Martin Esmann, and Christian Schneider — Carl von Ossietzky Universität Oldenburg, Germany

Monolayers of transition metal dichalcogenides (TMDs) offer new possibilities to study superconductivity. In this project, we investigate hybrid heterostructures of NbSe₂/MoSe₂ van der Waals layers, in the framework of cavity experiments. NbSe₂ and MoSe₂ are TMDs; superconductivity occurs in NbSe₂ [1], and the monolayer MoSe₂ is a direct band gap semiconductor that hosts excitons with high oscillator strength. By embedding the NbSe₂/MoSe₂ heterostructure in an open cavity [2], we achieve strong coupling between the MoSe₂ excitons and the cavity photons, forming exciton-polaritons, as evidenced by the pronounced Rabi gap seen in subsequent longitudinal and transversal cavity modes in where we tuned the open cavity length. This implementation of a hybrid superconductor-semiconductor monolayer polariton cavity forms the foundation of experiments to gain insight into how exciton-polariton coupling can influence the superconductive phase of NbSe₂ and allow us to further investigate optically tunable superconducting hybrid systems.

References [1]Xi, X., Wang, Z., Zhao, W. et al. Ising pairing in superconducting NbSe₂ atomic layers. Nature Phys 12, 139-143 (2016)., Journal 100, 101101 (2009) [2]J.C., Drawer et al., Nano Letters 2023 23 (18), 8683-8689

Keywords: TMD Superconductor; Open cavity; Exciton-polaritons