Strong coupling between a dielectric nanocavity and a monolayer transition metal dichalcogenide

TL;DR

This paper reports the experimental demonstration of strong coupling between a dielectric nanocavity and monolayer MoTe2 excitons, achieving significant Rabi splitting and opening avenues for nonlinear quantum optics at the single-photon level.

Contribution

It introduces a novel strong coupling system between dielectric nanocavities and 2D material excitons with quantitative agreement between experiment and theory.

Findings

Achieved Rabi splitting larger than system losses.

Demonstrated strong coupling via photoluminescence and reflection.

Validated results with a new exciton reaction coordinate formalism.

Abstract

We demonstrate strong coupling between light in a dielectric nanocavity with deep sub-wavelength confinement and excitons in a monolayer of molybdenum ditelluride. Avoided crossing is demonstrated by both photoluminescence and reflection measurements, from which we extract a light-matter interaction strength of $g_{\mathrm{PL}} =\SI{5.3\pm0.3}{\milli\eV}$ and $g_{\mathrm{R}} =\SI{4.7\pm0.7}{\milli\eV}$, respectively. The associated Rabi splitting is twice as large as the system's losses. These values are in good agreement with values obtained by a novel exciton reaction coordinate formalism, yielding $g_{\mathrm{theory}} = \SI{5.2\pm0.7}{\milli\eV}$. The strong light-matter interaction, combined with low losses and sub-wavelength confinement of light, black demonstrates a new regime of light-matter interactions where strong nonlinearities at the single-photon level are expected.