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HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.16: Poster

Wednesday, March 29, 2023, 17:00–19:00, P1

Towards strong coupling of confined excitons to a fiber-based microcavity — •Moritz Scharfstädt, Michael Köhl, and Andrea Bergschneider — Physikalisches Institut, Universität Bonn, Wegelerstraße 8, 53115 Bonn, Germany

Excitons in monolayer transition-metal dichalcogenides (TMD) exhibit large oscillator strengths and hence are well-suited for strong light-matter coupling. While for free excitons strong coupling to photonic cavities has been demonstrated in numerous experiments, nonlinearities in those systems are relatively weak. The recently demonstrated quantum confinement of excitons to length scales of about 20nm is a promising route towards enhancing nonlinearities [1].

We want to realize confined excitons with the prospect of embedding them into a high-finesse microcavity and reach the strong coupling regime. To confine the excitons in transverse direction and tune their energy, we develop a specific electric gate configuration. Our microcavity will be fiber-based and tunable at cryogenic temperatures. With this platform we aim for the realization of a quantum emitter in a cavity by harvesting the enhanced nonlinearity combined with a cavity-enabled photon blockade.

[1] Thureja et al., Nature 606, 298-304 (2022)