MoTe2 monolayers and bilayers are unique within the family of van-der-Waals materials since they pave the way towards atomically thin infrared light-matter quantum interfaces, potentially reaching the important telecommunication windows. Here, we report emergent exciton-polaritons based on MoTe2 monolayer and bilayer in a low-temperature open micro-cavity in a joint experiment-theory study. Our experiments clearly evidence both the enhanced oscillator strength and enhanced luminescence of MoTe2 bilayers, signified by a 38 \% increase of the Rabi-splitting and a strongly enhanced relaxation of polaritons to low-energy states. The latter is distinct from polaritons in MoTe2 monolayers, which feature a bottleneck-like relaxation inhibition. Both the polaritonic spin-valley locking in monolayers and the spin-layer locking in bilayers are revealed via the Zeeman effect, which we map and control via the light-matter composition of our polaritonic resonances.
@article{arxiv.2407.14902,
title = {Infrared magneto-polaritons in MoTe$_2$ mono- and bilayers},
author = {Bo Han and Jamie M. Fitzgerald and Lukas Lackner and Roberto Rosati and Martin Esmann and Falk Eilenberger and Takashi Taniguchi and Kenji Watanabe and Marcin Syperek and Ermin Malic and Christian Schneider},
journal= {arXiv preprint arXiv:2407.14902},
year = {2024}
}