Direct observation of split-mode exciton-polaritons in a single MoS$_2$ nanotube

A. I. Galimov; D. R. Kazanov; A. V. Poshakinskiy; M. V. Rakhlin; I. A. Eliseyev; A. A. Toropov; M. Remskar; T. V. Shubina

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arXiv · 2401.00348

Direct observation of split-mode exciton-polaritons in a single MoS$_2$ nanotube

A. I. Galimov·D. R. Kazanov·A. V. Poshakinskiy·M. V. Rakhlin·I. A. Eliseyev·A. A. Toropov·M. Remskar·T. V. Shubina

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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$_2$ tubes with both variable and constant gaps. Observed Rabi splitting in the 40 - 60 meV range is comparable to that for a MoS$_2$ 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.

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A. I. Galimov, D. R. Kazanov, A. V. Poshakinskiy, M. V. Rakhlin, I. A. Eliseyev, A. A. Toropov, M. Remskar, T. V. Shubina. 2023-12-30. Direct observation of split-mode exciton-polaritons in a single MoS$_2$ nanotube. https://arxiv.org/abs/2401.00348

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