We explore the zero-phonon line of single photon emitters in helium-ion treated monolayer MoS2, which are currently understood in terms of single sulfur-site vacancies. By comparing the linewidths of the zero-phonon line as extracted directly from optical spectra with values inferred from the first-order autocorrelation function of the photoluminescence, we quantify bounds of the homogeneous broadening and of phonon-assisted contributions. The results are discussed in terms of both the independent boson model and ab-initio results as computed from GW and Bethe-Salpeter equation approximations.
@article{arxiv.2601.12521,
title = {Zero-phonon line emission of single photon emitters in helium-ion treated MoS$_2$},
author = {Katja Barthelmi and Tomer Amit and Mirco Troue and Lukas Sigl and Alexander Musta and Tim Duka and Samuel Gyger and Val Zwiller and Matthias Florian and Michael Lorke and Takashi Taniguchi and Kenji Watanabe and Christoph Kastl and Jonathan Finley and Sivan Refaely-Abramson and Alexander W. Holleitner},
journal= {arXiv preprint arXiv:2601.12521},
year = {2026}
}