Multiplicative topological semimetals

TL;DR

This paper introduces and characterizes new multiplicative topological semimetal phases in electronic systems, revealing unique bulk-boundary phenomena and transport signatures that expand the understanding of topological effects in condensed matter physics.

Contribution

It extends the concept of multiplicative topological phases to semimetals, uncovering previously overlooked phases with minimal symmetry protection and distinctive physical signatures.

Findings

Discovery of new multiplicative topological semimetal phases

Rich bulk-boundary correspondence and response signatures

Implications for Fermi arc connectivity and chiral anomaly

Abstract

Exhaustive study of topological semimetal phases of matter in equilibriated electonic systems and myriad extensions has built upon the foundations laid by earlier introduction and study of the Weyl semimetal, with broad applications in topologically-protected quantum computing, spintronics, and optical devices. We extend recent introduction of multiplicative topological phases to find previously-overlooked topological semimetal phases of electronic systems in equilibrium, with minimal symmetry-protection. We show these multiplicative topological semimetal phases exhibit rich and distinctive bulk-boundary correspondence and response signatures that greatly expand understanding of consequences of topology in condensed matter settings, such as the limits on Fermi arc connectivity and structure, and transport signatures such as the chiral anomaly. Our work therefore lays the foundation for extensive future study of multiplicative topological semimetal phases.