An improved holographic nodal line semimetal

TL;DR

This paper presents an improved holographic model for strongly coupled nodal line semimetals, incorporating duality relations and topological features, revealing a quantum phase transition and multiple nodal lines.

Contribution

The model introduces a duality-consistent holographic framework with a Chern-Simons and mass term, capturing topological phases and phase transitions in nodal line semimetals.

Findings

Existence of a quantum phase transition from topological to trivial phase

Multiple topologically nontrivial nodal lines in the spectrum

Bulk geometries differ from previous models but exhibit similar properties

Abstract

We study an improved holographic model for the strongly coupled nodal line semimetal which satisfies the duality relation between the rank two tensor operators $\bar{\psi}\gamma^{\mu \nu}\psi$ and $\bar{\psi}\gamma^{\mu \nu}\gamma^5\psi$. We introduce a Chern-Simons term and a mass term in the bulk for a complex two form field which is dual to the above tensor operators and the duality relation is automatically satisfied from holography. We find that there exists a quantum phase transition from a topological nodal line semimetal phase to a trivial phase. In the topological phase, there exist multiple nodal lines in the fermionic spectrum which are topologically nontrivial. The bulk geometries are different from the previous model without the duality constraint, while the resulting properties are qualitatively similar to those in that model. This improved model provides a more natural ground to analyze transports or other properties of strongly coupled nodal line semimetals.