# Towards exciton-polaritons in MoS$_2$ nanotubes

## TL;DR

This study investigates exciton-polariton formation in MoS₂ nanotubes by analyzing low-temperature photoluminescence spectra, revealing strong coupling potential with Rabi splitting up to 400 meV and implications for optical mode manipulation.

## Contribution

It demonstrates the potential for exciton-polariton formation in MoS₂ nanotubes through detailed spectral analysis and identifies conditions for strong coupling with significant Rabi splitting.

## Key findings

- Optical whispering gallery modes observed below exciton resonance.
- Peak variations linked to nanotube geometry and wall thickness fluctuations.
- Potential for strong exciton-photon coupling with Rabi splitting up to 400 meV.

## Abstract

We measure low-temperature micro-photoluminescence spectra along a MoS$_2$ nanotube, which exhibit the peaks of the optical whispering gallery modes below the exciton resonance. The variation of the position and intensity of these peaks is used to quantify the change of the nanotube geometry. The width of the peaks is shown to be determined by the fluctuations of the nanotube wall thickness and propagation of the detected optical modes along the nanotube. We analyse the dependence of the energies of the optical modes on the wave vector along the nanotube axis and demonstrate the potential of the high-quality nanotubes for realization of the strong coupling between exciton and optical modes with the Rabi splitting reaching 400 meV. We show how the formation of exciton-polaritons in such structures will be manifested in the micro-photoluminescence spectra.