A two-dimensional (2D) semiconducting microcavity, where exciton polaritons can be formed, constitutes a promising setup for exploring and manipulating various regimes of light-matter interaction. Here, the coupling between 2D excitons and metallic cavity photons is studied by using a first-principles propagator technique. The strength of exciton-photon coupling is characterised by its Rabi splitting to two exciton polaritons, which can be tuned by cavity thickness. Maximum splitting of 128 meV is achieved in the phosporene cavity, while a remarkable value of about 440 meV is predicted in a monolayer hexagonal boron nitride device. The obtained Rabi splittings in a ${\mathrm{WS}}_2$ microcavity are in excellent agreement with recent experiments. The present methodology can aid in predicting and proposing potential setups for trapping robust 2D exciton-polariton condensates.

• Received 12 May 2021
• Revised 12 August 2021
• Accepted 16 August 2021

DOI:https://doi.org/10.1103/PhysRevResearch.3.L032056

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society