We report lasing of moir\'e trapped interlayer excitons (IXs) by integrating a pristine hBN-encapsulated MoSe2/WSe2 heterobilayer into a high-Q (>104) nanophotonic cavity. We control the cavity-IX detuning using a magnetic field and measure their dipolar coupling strength to be 78±4μeV, fully consistent with the 82 μeV predicted by theory. The emission from the cavity mode shows clear threshold-like behavior as the transition is tuned into resonance with the cavity. We observe a superlinear power dependence accompanied by a narrowing of the linewidth as the distinct features of lasing. The onset and prominence of these threshold-like behaviors are pronounced at resonance while weak off-resonance. Our results show that a lasing transition can be induced in interacting moir\'e IXs with macroscopic coherence extending over the length scale of the cavity mode. Such systems raise interesting perspectives for low-power switching and synaptic nanophotonic devices using two-dimensional materials.
@article{arxiv.2302.07046,
title = {Lasing of Moir\'e Trapped MoSe$_2$/WSe$_2$ Interlayer Excitons Coupled to a Nanocavity},
author = {Chenjiang Qian and Mirco Troue and Johannes Figueiredo and Pedro Soubelet and Viviana Villafañe and Johannes Beierlein and Sebastian Klembt and Andreas V. Stier and Sven Höfling and Alexander W. Holleitner and Jonathan J. Finley},
journal= {arXiv preprint arXiv:2302.07046},
year = {2024}
}