Non-Fermi liquids from holography

TL;DR

This paper introduces a new class of non-Fermi liquids in 2+1 dimensions, identified through holographic methods, exhibiting Fermi surfaces and unique spectral properties in strongly interacting quantum field theories.

Contribution

It demonstrates the existence of non-Fermi liquids with Fermi surfaces using holography, revealing novel spectral phenomena and critical behavior in strongly coupled systems.

Findings

Evidence of Fermi surfaces in holographic models

Observation of particle-hole asymmetry and discrete scale invariance

Spectral behavior consistent with critical Fermi surfaces

Abstract

We report on a potentially new class of non-Fermi liquids in (2+1)-dimensions. They are identified via the response functions of composite fermionic operators in a class of strongly interacting quantum field theories at finite density, computed using the AdS/CFT correspondence. We find strong evidence of Fermi surfaces: gapless fermionic excitations at discrete shells in momentum space. The spectral weight exhibits novel phenomena, including particle-hole asymmetry, discrete scale invariance, and scaling behavior consistent with that of a critical Fermi surface postulated by Senthil.