Dynamical mean-field study of a photon-mediated ferroelectric phase transition

TL;DR

This study uses dynamical mean-field theory to analyze how light-mediated interactions influence ferroelectric phase transitions in a 2D material coupled to surface plasmons, revealing enhanced ferroelectric order.

Contribution

It introduces a dynamical mean-field approach to model photon-mediated interactions and demonstrates their role in stabilizing ferroelectric phases in a minimal 2D system.

Findings

Photon-mediated interactions enhance ferroelectric order.

Mean-field approximation shows no effect of light-matter coupling on transition.

Bosonic dynamical mean-field theory reveals stabilization of ferroelectric phase.

Abstract

The interplay of light and matter gives rise to intriguing cooperative effects in quantum many-body systems. This is even true in thermal equilibrium, where the electromagnetic field can hybridize with collective modes of matter, and virtual photons can induce interactions in the solid. Here, we show how these light-mediated interactions can be treated using the dynamical mean-field theory formalism. We consider a minimal model of a two-dimensional material that couples to a surface plasmon polariton mode of a metal-dielectric interface. Within the mean-field approximation, the system exhibits a ferroelectric phase transition that is unaffected by the light-matter coupling. Bosonic dynamical mean-field theory provides a more accurate description and reveals that the photon-mediated interactions enhance the ferroelectric order and stabilize the ferroelectric phase.