Donor-donor interaction mediated by cavity-photons and its relation to interactions mediated by excitons and polaritons

TL;DR

This paper presents theoretical models showing how photons mediate long-range, Ising-like interactions between donors in cavities, similar to polaritons, and compares these to exciton-mediated interactions in semiconductors.

Contribution

It introduces models predicting photon-mediated donor interactions in cavities and compares them to exciton and polariton interactions, highlighting the long-range behavior of photons.

Findings

Photons mediate Ising-like interactions between donors.

At large distances, photon and polariton interactions show similar dependence.

Photons are responsible for the long-range nature of polariton interactions.

Abstract

I report theoretical predictions of two models of donor-donor indirect interaction mediated by photons in zero- and two-dimensional cavities. These results are compared to previously studied cases of indirect interactions mediated by excitons and/or polaritons in bulk semiconductor and two-dimensional cavities. I find that photons mediate an Ising-like interaction between donors in the same manner polaritons do, in contrast to the Heisenberg-like interaction mediated by exciton. For the particular case of a two-dimensional cavity, the model shows that the dependence on distance of the donor-donor coupling constant is the same for photons and polaritons when the donor-donor distance is large. Then, it becomes clear that photons are responsible for the long range behavior of the polariton indirect interaction.