The strange attraction phenomenon in cQED: the intermediate quantum coupling regime

TL;DR

This paper provides a theoretical explanation for the attraction phenomenon observed in cavity QED systems, revealing an intermediate coupling regime that exhibits features of both weak and strong coupling, supported by experimental agreement.

Contribution

It introduces the concept of an intermediate quantum coupling regime in cQED, explaining experimental attraction phenomena through a dynamical phase transition model.

Findings

Successful theoretical explanation of cavity-exciton attraction

Identification of an intermediate coupling regime in cQED

Qualitative agreement with experimental observations

Abstract

We theoretically investigate the strange phenomenon of attraction between the cavity mode and the exciton mode that has been experimentally observed in a photonic crystal cavity. Our results within the Lindblad master equation approach successfully explain why the apparent cavity-to-exciton spectral shifting occurs, and how this phenomenon is a manifestation of a dynamical phase transition in the system. Moreover, our findings are in good qualitative agreement with pioneer experimental results as well as support the hypothesis that an intermediate coupling regime exists in the cavity quantum electrodynamics. In fact, this new quantum regime exhibits phenomenology from both weak and strong coupling regimes simultaneously.