Interaction-induced metallicity in a two-dimensional disordered non-Fermi liquid

TL;DR

This paper explores how disorder affects a non-Fermi liquid near a 2D ferromagnetic quantum critical point, revealing a stable fixed point with perfect conduction unlike disordered Fermi liquids.

Contribution

It introduces a model starting from a non-Fermi liquid near a quantum critical point, showing disorder leads to a stable metallic state without runaway flows.

Findings

Disorder does not cause runaway flows in the non-Fermi liquid model.

The system exhibits a marginally stable fixed point with perfect conduction.

Contrasts with disordered Fermi liquids which tend to localization.

Abstract

The interplay of interactions and disorder in two-dimensional (2D) electron systems has actively been studied for decades. The paradigmatic approach involves starting with a clean Fermi liquid and perturbing the system with both disorder and interactions. We instead start with a clean non-Fermi liquid near a 2D ferromagnetic quantum critical point and consider the effects of disorder. In contrast with the disordered Fermi liquid, we find that our model does not suffer from runaway flows to strong coupling and the system has a marginally stable fixed point with perfect conduction.