Non-Markovian model of photon-assisted dephasing by electron-phonon interactions in a coupled quantum-dot-cavity system

TL;DR

This paper explores how non-Markovian electron-phonon interactions significantly alter the dynamics of a quantum-dot-cavity system, revealing phonon-induced spectral asymmetries and temperature effects on light-matter coupling.

Contribution

It introduces a non-Markovian model capturing photon-assisted dephasing effects, highlighting phenomena absent in traditional Markovian approaches.

Findings

Non-Markovian effects cause spectral asymmetry in the system.

Temperature reduces the effective light-matter coupling strength.

Photon-assisted dephasing significantly impacts quantum-dot-cavity dynamics.

Abstract

We investigate the influence of electron-phonon interactions on the dynamical properties of a quantum-dot-cavity QED system. We show that non-Markovian effects in the phonon reservoir lead to strong changes in the dynamics, arising from photon-assisted dephasing processes, not present in Markovian treatments. A pronounced consequence is the emergence of a phonon induced spectral asymmetry when detuning the cavity from the quantum-dot resonance. The asymmetry can only be explained when considering the polaritonic quasi-particle nature of the quantum-dot-cavity system. Furthermore, a temperature induced reduction of the light-matter coupling strength is found to be relevant in interpreting experimental data, especially in the strong coupling regime.