Nexus networks in carbon honeycombs

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.

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• Universal higher-order bulk-boundary correspondence of triple nodal points
• Triple nodal points characterized by their nodal-line structure in all magnetic space groups
• Transport evidence of triply degenerate nodal semimetal YRh6Ge4
• Design triple points, nexus points and related topological phases by stacking monolayers