Photoluminescence of a microcavity quantum dot system in the quantum strong-coupling regime

TL;DR

This paper investigates the photoluminescence behavior of a quantum dot in a microcavity within the quantum strong-coupling regime, highlighting the transition from a single peak to a doublet in the emission spectrum under pulsed excitation.

Contribution

It provides the first detailed analysis of PL properties in the QSC regime of semiconductor nanostructures, emphasizing the spectral and temporal changes during the transition.

Findings

PL spectrum shifts from a peak to a doublet in the QSC regime

Temporal PL variations depend on pulse duration relative to cavity decay

QSC regime achieved in semiconductor nanostructures

Abstract

The Jaynes-Cummings model, describing the interaction between a single two-level system and a photonic mode, has been used to describe a large variety of systems, ranging from cavity quantum electrodynamics, trapped ions, to superconducting qubits coupled to resonators. Recently there has been renewed interest in studying the quantum strong-coupling (QSC) regime, where states with photon number greater than one are excited. This regime has been recently achieved in semiconductor nanostructures, where a quantum dot is trapped in a planar microcavity. Here we study the quantum strong-coupling regime by calculating its photoluminescence (PL) properties under a pulsed excitation. We discuss the changes in the PL as the QSC regime is reached, which transitions between a peak around the cavity resonance to a doublet. We particularly examine the variations of the PL in the time domain, under regimes of short and long pulse times relative to the microcavity decay time.