Quantum Phase Transition in the Dicke Model

TL;DR

This paper investigates a quantum phase transition in the Dicke model involving N atoms, focusing on the transition between normal and superradiant phases influenced by squeezed photon interactions.

Contribution

It introduces a modified Jaynes-Cummings model with squeezed photons and demonstrates a quantum phase transition in the Dicke model with both co- and counter-rotating couplings.

Findings

Identifies a normal to superradiance quantum phase transition.

Shows the role of squeezed photons in the phase transition.

Analyzes the effects of independent co- and counter-rotating couplings.

Abstract

We consider a previously modified Jaynes-Cummings model with single-photon cavity radiation field and atomic system exchanging a squeezed photon and deduce a normal/superradiance quantum phase transition in the Dicke model of N atoms of arbitrary spin with independent co- and counter-rotating coupling terms.