Fermi arc plasmons in Weyl semimetals

This is the authors' abstract. We don't add key points for this paper.

Weyl semimetals, prototypical three dimensional topological metals, possess a unique band structure that has enriched the ``standard model'' of metallic behavior. This work unveils how the unusual topological surface states of Weyl semimetals radically alter their plasmonic characteristics, yielding intrinsic hyperbolic surface plasmons. These Fermi-arc plasmons have a rich phenomenology, and arise from the coupled dynamics of carriers both on the unusual open-segment surface Fermi arc and the bulk Fermi surface, clearly demonstrating the intricate interplay of bulk and surface. While Fermi-arc plasmons are fascinating in their own right, the essential role that the open-segment Fermi arcs play also indicates more broadly that Weyl semimetals may host new types of interacting phenomena not realizable in conventional metals {-} an exciting prospect for future developments.