High temperature phase transition in the coupled atom-light system in the presence of optical collisions

TL;DR

This paper investigates a high temperature phase transition to a superradiant state in a coupled atom-light system with optical collisions, highlighting the role of polaritons and potential experimental observation in waveguides.

Contribution

It demonstrates a high temperature second order phase transition to superradiance in a coupled atom-light system with optical collisions, linking it to polariton superfluidity.

Findings

Photonic field exhibits high temperature phase transition to superradiance.

Transition connected with superfluid properties of photon-like polaritons.

Potential observation in metallic cylindrical waveguides.

Abstract

The problem of photonic phase transition for the system of a two-level atomic ensemble interacting with a quantized single-mode electromagnetic field in the presence of optical collisions (OC) is considered. We have shown that for large and negative atom-field detuning a photonic field exhibits high temperature second order phase transition to superradiant state under thermalization condition for coupled atom-light states. Such a transition can be connected with superfluid (coherent) properties of photon-like low branch (LB) polaritons. We discuss the application of metallic cylindrical waveguide for observing predicted effects.