Topological nodal line semimetals in holography

TL;DR

This paper develops a holographic model of a strongly coupled topological nodal line semimetal, revealing phase transitions and topological features through dual fermion spectral functions, and proposes a framework for constructing such materials holographically.

Contribution

It introduces a holographic approach to model strongly coupled topological nodal line semimetals and explores their phase transitions and topological properties.

Findings

NLSM phase exhibits multiple Fermi surfaces as closed nodal loops.

A quantum phase transition from NLSM to trivial state is identified.

Topological structure arises from IR interplay between dual operators.

Abstract

We show a holographic model of a strongly coupled topological nodal line semimetal (NLSM) and find that the NLSM phase could go through a quantum phase transition to a topologically trivial state. The dual fermion spectral function shows that there are multiple Fermi surfaces each of which is a closed nodal loop in the NLSM phase. The topological structure in the bulk is induced by the IR interplay between the dual mass operator and the operator that deforms the topology of the Fermi surface. We propose a practical framework for building various strongly coupled topological semimetals in holography, which indicates that at strong coupling topologically nontrivial semimetal states generally exist.