Correlated triple-Weyl semimetals with Coulomb interactions

TL;DR

This paper investigates how Coulomb interactions influence the low-energy physics of triple-Weyl semimetals, revealing a transition to a marginal Fermi liquid state with anisotropic screening.

Contribution

It provides a renormalization group analysis showing Coulomb interactions destabilize noninteracting triple-Weyl points, leading to a novel stable fixed point with unique physical properties.

Findings

Coulomb interactions destabilize noninteracting triple-Weyl fermions.

System flows to a marginal Fermi liquid fixed point.

Anisotropic screening effects emerge in the correlated phase.

Abstract

We study interaction effects, including both long-ranged Coulomb and short-range interactions, in three-dimensional topological triple-Weyl semimetals whose triple-Weyl points are protected by crystal symmetries. By performing Wilsonian renormalization group analysis of the low-energy effective field theory of the minimal model with triple-Weyl nodes, we find that the fixed point of noninteracting triple-Weyl fermions is unstable in the presence of Coulomb interactions and flows to a nontrivial stable fixed point representing marginal Fermi liquids with anisotropic screening effects. We further discuss relevant unusual physical consequences due to the novel behavior of correlation effects in this system.