Phase diagram of the magnetized planar Gross-Neveu model beyond the large-N approximation

TL;DR

This study investigates the phase diagram of the (2+1)-dimensional Gross-Neveu model under magnetic fields using optimized perturbation theory, revealing finite N effects like inverse magnetic catalysis and intermediate phase transitions.

Contribution

It introduces the use of optimized perturbation theory to analyze the model beyond the large-N approximation, highlighting new effects such as inverse magnetic catalysis and phase transition behavior.

Findings

Finite N effects favor inverse magnetic catalysis with negative coupling.

The coexistence chemical potential decreases with magnetic field in OPT, opposite to large-N results.

Intermediate nonchiral phase transitions occur at low magnetic fields and temperatures, linked to de Haas--van Alphen oscillations.

Abstract

The phase diagram and thermodynamic properties of the (2+1)-dimensional Gross-Neveu model are studied in the presence of a constant magnetic field. The optimized perturbation theory (OPT) is used to obtain results going beyond the large-N approximation. The free energy and the complete phase diagram of the model, in terms of temperature, chemical potential and magnetic field are obtained and studied in details. By comparing the results from the OPT and the large-N approximation, we conclude that finite N effects favor the phenomenon of inverse magnetic catalysis when the coupling constant is negative. We show that with the OPT the value of the coexistence chemical potential at vanishing temperature always decreases with the magnetic field. This is opposite to what is seen in the large-N approximation, where for large magnetic fields the coexistence chemical potential starts again to increase. Likewise, at finite temperature, the value of the chemical potential at the tricritical point also decreases with the magnetic field in the OPT case. Consequently, the shape of the phase diagrams predicted by the OPT and by the large-N approximation look very different in the presence of high magnetic fields. Finally, for small values of magnetic field and temperature, we identify the presence of possible intermediate nonchiral phase transitions when varying the chemical potential. We show that these phenomena are not an artifact of the large-N approximation and that they also occur within the OPT framework. These intermediate transitions are interpreted to be a consequence of the de Haas--van Alphen oscillations. We also explain why this type of phenomenon can happen in general for negative couplings but not for positive couplings.