Chiral symmetry restoration in RQED at finite temperature in the supercritical coupling regime

TL;DR

This paper investigates how finite temperature affects chiral symmetry breaking in reduced QED models relevant to 2D materials like graphene, identifying critical coupling and temperature values for symmetry restoration.

Contribution

It provides a detailed analysis of chiral symmetry restoration at finite temperature in RQED using Schwinger-Dyson equations, extending understanding in supercritical coupling regimes.

Findings

Chiral symmetry breaks when coupling exceeds a critical value.

Thermal effects can restore chiral symmetry at high temperatures.

Critical temperature depends on the coupling strength.

Abstract

We explore the conditions for chiral symmetry breaking in reduced (or pseudo) quantum electrodynamics at finite temperature in connection with graphene and other 2D-materials with an underlying Dirac behavior of the charge carriers. By solving the corresponding Schwinger-Dyson equation in rainbow approximation, in a Landau-like gauge and neglecting wavefunction renormalization effects, we find the need of the coupling to exceed a critical value $\alpha_c$ in order for chiral symmetry to be broken, in agreement with known results from other groups. In this supercritical regime, we add the effects of a thermal bath at temperature $T$ and find the critical values of this parameter that leads to chiral symmetry restoration.