Holographic Fermi surfaces and bulk dipole couplings

TL;DR

This paper explores how adding a dipole coupling in holographic models affects Fermi surfaces and low-energy physics, revealing modifications in scaling dimensions and Fermi surface locations while maintaining the framework's robustness.

Contribution

It introduces a bulk dipole coupling into holographic models, showing its impact on Fermi surface properties and low-energy scaling dimensions.

Findings

Dipole coupling alters low-energy scaling dimensions.

Fermi surface locations in momentum space are shifted.

The holographic non-Fermi liquid structure remains robust.

Abstract

Non-Fermi liquids can be studied using holographic duality. The low energy physics of a holographic Fermi surface is controlled by an emergent scale invariance. After reviewing these developments, we generalize the holographic calculation to include in the bulk action the leading irrelevant operator, which is a dipole coupling between the spinor field and the background gauge field. We find that this dipole coupling changes the attainable low-energy scaling dimensions, and changes the locations of the Fermi surfaces in momentum space. The structure of the holographic framework for non-Fermi liquids is, however, robust under this deformation.