Holographic non-relativistic fermionic fixed point and bulk dipole coupling

TL;DR

This paper explores how bulk dipole coupling affects the spectral function at non-relativistic fermionic fixed points, revealing modifications to flat bands and the emergence of new Fermi surfaces, differing from relativistic cases.

Contribution

It introduces the impact of bulk dipole coupling on spectral functions at non-relativistic fixed points, highlighting novel phenomena not observed in relativistic fixed points.

Findings

Flat band persists with dipole coupling but is modified at small momenta.

A new Fermi surface emerges from the gap when dipole coupling dominates.

Differences from relativistic fixed points are emphasized.

Abstract

Inspired by the recently discovered non-relativistic fermionic fixed points, we investigate how the presence of bulk dipole coupling modifies the spectral function at one of these novel fixed points. As a result, although the infinite flat band is always visible in the presence of the bulk dipole coupling as well as chemical potential, the band is modified in a remarkable way at small momenta up to the order of magnitude of bulk dipole coupling. On the other hand, like a phoenix, a new Fermi surface sprouts from the formed gap when the bulk dipole coupling is pushed up further such as to overshadow the charge parameter, which is obviously different from what is found at the relativistic fixed points.