Dipole Coupling Effect of Holographic Fermion in the Background of Charged Gauss-Bonnet AdS Black Hole

TL;DR

This paper explores how dipole coupling, spacetime dimension, and higher curvature corrections in a charged Gauss-Bonnet AdS black hole affect holographic fermion spectral properties, revealing richer boundary physics.

Contribution

It demonstrates that higher curvature effects and spacetime dimension significantly influence the Fermi gap and spectral density in holographic fermion systems.

Findings

Higher curvature modifies fermion spectral density.

Spacetime dimension affects Fermi momentum.

Fermi gap onset depends on dipole coupling and gravity corrections.

Abstract

We investigate the holographic fermions in the charged Gauss-Bonnet $AdS_{d}$ black hole background with the dipole coupling between fermion and gauge field in the bulk. We show that in addition to the strength of the dipole coupling, the spacetime dimension and the higher curvature correction in the gravity background also influence the onset of the Fermi gap and the gap distance. We find that the higher curvature effect modifies the fermion spectral density and influences the value of the Fermi momentum for the appearance of the Fermi surface. There are richer physics in the boundary fermion system due to the modification in the bulk gravity.