Direct observation of split-mode exciton-polaritons in a single MoS$_2$ nanotube
Abstract
A single nanotube synthesized from a transition metal dichalcogenide (TMDC) exhibits strong exciton resonances and, in addition, can support optical whispering gallery modes. This combination is promising for observing exciton-polaritons without an external cavity. However, traditional energy-momentum-resolved detection methods are unsuitable for this tiny object. Instead, we propose to use split optical modes in a twisted nanotube with the flattened cross-section, where a gradually decreasing gap between the opposite walls leads to a change in mode energy, similar to the effect of the barrier width on the eigenenergies in the double-well potential. Using micro-reflectance spectroscopy, we investigated the rich pattern of polariton branches in single MoS tubes with both variable and constant gaps. Observed Rabi splitting in the 40 - 60 meV range is comparable to that for a MoS monolayer in a microcavity. Our results, based on the polariton dispersion measurements and polariton dynamics analysis, present a single TMDC nanotube as a perfect polaritonic structure for nanophotonics.
Keywords
Cite
@article{arxiv.2401.00348,
title = {Direct observation of split-mode exciton-polaritons in a single MoS$_2$ nanotube},
author = {A. I. Galimov and D. R. Kazanov and A. V. Poshakinskiy and M. V. Rakhlin and I. A. Eliseyev and A. A. Toropov and M. Remskar and T. V. Shubina},
journal= {arXiv preprint arXiv:2401.00348},
year = {2024}
}