Light emission properties in a double quantum dot molecule immersed in a cavity: phonon-assisted tunneling

TL;DR

This paper investigates how phonon-assisted tunneling and wave function overlap influence light emission in a double quantum dot within a cavity, revealing their effects on emission spectra and quantum properties of emitted light.

Contribution

It analyzes the interplay between tunneling mechanisms in a double quantum dot in a cavity, highlighting regimes affecting emission characteristics and quantum coherence.

Findings

Different tunneling regimes alter emission spectra and photon statistics.

Phonon-assisted tunneling impacts the quantumness of emitted light.

Regimes influence the mean number of excitations in dots and cavity.

Abstract

Two main mechanisms dictate the tunneling process in a double quantum dot: overlap of excited wave functions, effectively described as a tunneling rate, and phonon-assisted tunneling. In this paper, we study different regimes of tunneling that arise from the competition between these two mechanisms in a double quantum dot molecule immersed in a unimodal optical cavity. We show how such regimes affect the mean number of excitations in each quantum dot and in the cavity, the spectroscopic resolution and emission peaks of the photoluminescence spectrum, and the second-order coherence function which is an indicator of the quantumness of emitted light from the cavity.