Quantum Electrodynamics of a Nanocavity Coupled with Exciton Complexes in a Quantum Dot

TL;DR

This paper develops a comprehensive quantum electrodynamics theory for nanocavity and exciton complexes in quantum dots, explaining experimental spectral triplets and revealing the role of quantum anti-Zeno effects and hyperfine interactions.

Contribution

It introduces a novel theoretical framework that predicts spectral triplets and explains phenomena observed in experiments with quantum dot nanocavities.

Findings

Spectral triplet predicted in strong coupling regime

Quantum anti-Zeno effect explains the central peak

Hyperfine interactions cause mixing of exciton states

Abstract

Here, a comprehensive theory of the couplings between a nanocavity and exciton complexes in a quantum dot is developed, which successfully predicts the spectral triplet in the strong coupling regime that has been observed in several experiments but is unexpected according to conventional cavity quantum electrodynamics. The quantum anti-Zeno effect is found to play an essential role in the appearance of the central peak in the triplet under a low-excitation regime. The effect of hyperfine interactions is also discussed, which results in the cavity-mediated mixing of bright and dark exciton states. These results provide significant insights into solid-state cavity quantum electrodynamics.