Effect of phonon coupling on cooperative two-photon emission from two-quantum dots

TL;DR

This paper predicts how phonon interactions influence cooperative two-photon emission in coupled quantum dots within a photonic crystal cavity, highlighting the contrasting effects of cavity and phonon couplings on emission processes.

Contribution

It introduces a theoretical model analyzing phonon and cavity effects on two-photon emission from quantum dots, revealing the conditions under which phonon interactions enhance emission.

Findings

Cavity-induced two-photon emission is suppressed by electron-phonon coupling.

Phonon-induced two-photon emission increases with temperature.

Identical quantum dots exhibit negligible cavity-induced but significant phonon-induced emission.

Abstract

We predict dominating cooperative two-photon emission from two quantum dots coupled with a single mode photonic crystal cavity. The cooperative two photon emission occurs when excitons in two off-resonantly coupled quantum dots decay simultaneously. The interaction with common cavity field leads to cavity induced two-photon emission which is strongly inhibited by electron phonon coupling. The interaction with common phonon bath produces phonon induced two-photon emission which increases on increasing temperature. For identical quantum dots cavity induced two-photon emission is negligible but phonon induced two-photon emission could be large.