Nexus networks in carbon honeycombs

TL;DR

This paper introduces new topological nexus networks in carbon honeycombs, revealing phase transitions and unique magnetic transport properties, advancing the understanding of novel topological materials.

Contribution

It proposes and analyzes nexus networks in carbon honeycombs, demonstrating phase transitions and unique transport phenomena in these topological systems.

Findings

Nexus networks can be realized in carbon honeycombs.

A phase transition between nexus networks and triply-degenerate points occurs.

Unusual magnetic transport properties are observed in nexus networks.

Abstract

Nexus metals represent a new type of topological material in which nodal lines merge at nexus points. Here, we propose novel networks in nexus systems through intertwining between nexus fermions and additional nodal lines. These nexus networks can be realized in several recently synthesized carbon honeycomb materials. In these carbon honeycombs, we demonstrate a phase transition between a nexus network and a system with triply-degenerate points and additional nodal lines. The Landau level spectra show unusual magnetic transport properties in the nexus networks. Our results pave the way toward realizations of new topological materials with novel transport properties beyond standard Weyl/Dirac semimetals.