Origin of the emission within the cavity mode of coupled quantum dot-cavity systems

TL;DR

This study investigates the emission origin in coupled quantum dot-cavity systems, revealing that fast dephasing of quantum dot states causes emission within the cavity mode, supported by time-resolved photoluminescence data.

Contribution

It provides new insight into the emission mechanism in quantum dot-cavity systems, linking cavity mode emission to quantum dot dephasing effects.

Findings

Emission within the cavity mode matches the dynamics of the closest quantum dot state.

Fast dephasing of quantum dots is responsible for cavity mode emission.

Proposes an explanation for photon correlation measurements in similar systems.

Abstract

The origin of the emission within the optical mode of a coupled quantum dot-micropillar system is investigated. Time-resolved photoluminescence is performed on a large number of deterministically coupled devices in a wide range of temperature and detuning. The emission within the cavity mode is found to exhibit the same dynamics as the spectrally closest quantum dot state. Our observations indicate that fast dephasing of the quantum dot state is responsible for the emission within the cavity mode. An explanation for recent photon correlation measurements reported on similar systems is proposed.