Dyonic Stars for Holography

TL;DR

This paper constructs a holographic model of dyonic stars in AdS_4, incorporating both electric and magnetic charges, to study strongly coupled (2+1)-dimensional CFTs with finite density and magnetic field.

Contribution

It provides a detailed microscopic construction of dyonic black brane backgrounds with charged fermions, advancing holographic models of condensed matter systems under magnetic fields.

Findings

Derived fluid approximations from bulk fermions.

Constructed back-reacted dyonic black brane solutions.

Linked gravitational solutions to strongly coupled CFTs with magnetic fields.

Abstract

We construct back-reacted asymptotically AdS_4 backgrounds with both electric and magnetic charge, at finite temperature and chemical potential. The system consists of a condensed bulk Dirac field hovering over a charged black brane. We give a detailed microscopic treatment of the bulk fermions, from which we derive the usual fluid approximations describing the condensate. In the context of holography, such a gravitational solution is dual to a (2+1)-dimensional CFT with a U(1) current, at finite density and strong coupling, subjected to a transverse magnetic field.