Exciton-polariton dynamics of the single site-controlled quantum dot-nanocavity in the coexisting strong-weak coupling regime. J. Huang, W. Liu, M. Sarihan, X. Cheng, A. Miranda, B. Dwir, A. Rudra, E. Kapon and C. Wong in New J. Phys. 25:033015 (2023).  What the paper says!?

This paper reports the experimental finding of a mechanism of so-called "intermediate coupling regime" that is a sort of coexistence of weak and strong coupling, as was first theorized in arXiv:1806.10160 which is, however, not cited, but attributed to independent works published by our Colombian co-authors in a way that is discussed on the page for their papers.

Note that in addition to the "Colombian mechanism", the Authors also mention refs. [52-53]:

Apart from the clear distinction between strong and weak coupling, recent studies indicate the possibility of the intermediate coupling regime, which shares the coexisting features of both strong and weak coupling, as observed in self-assembled GaAs-based QDs in micropillar [52] and PhC cavities [53].

where

• [52] is Giesz V. 2015 Cavity-enhanced photon-photon interactions with bright quantum dot sources PhD thesis Université Paris-Saclay.
• [53] is Cavity-QED assisted attraction between a cavity mode and an exciton mode in a planar photonic-crystal cavity. T. Tawara, H. Kamada, T. Tanabe, T. Sogawa, H. Okamoto, P. Yao, P. Pathak and S. Hughes in Opt. Express 18:2719 (2010)..

Justification of phonon-assisted QD-cavity interactions:

Specifically, recent theoretical studies suggest that phonon-assisted QD-cavity interaction plays an important role in this intermediate coupling regime [43, 44].

A device was engineered on purpose:

Based on our tailored device, we achieve the intermediate coupling regime and systematically investigate the related phonon-mediated coupling and carrier recombination dynamics

First distinguishing their observation from mode pulling:

the observed behavior of avoided-like crossing of CM deviates from the mode pulling effect (namely, a tendency of CM energy shifting towards X near resonance), the latter of which results from the spectral overlaps of a low-Q CM and the X phonon sideband [72]

then it comes to the "Colombian mechanism":

In this intermediate coupling regime [73], both strong and weak coupling features coexist, as studied recently theoretically. It indicates that the avoided crossing can be attributed to the Rabi doublet in the canonical strong coupling regime, with the unchanged CM energy near zero-detuning as a signature of the phonon-mediated collective states emission in the intermediate coupling regime [73, 74]

where

• [73] is The strange attraction phenomenon in cQED: The intermediate quantum coupling regime. S. Echeverri-Arteaga, H. Vinck-Posada and E. Gómez in Optik 183:389 (2019).
• [74] is Explanation of the quantum phenomenon of off-resonant cavity-mode emission. S. Echeverri-Arteaga, H. Vinck-Posada and E. Gómez in Phys. Rev. A 97:043815 (2018).