Fermi arc reconstruction at junctions between Weyl semimetals

TL;DR

This paper derives conditions for localized interface modes between Weyl semimetals, revealing Fermi arc reconstructions that persist despite differences in Fermi arc connectivities, advancing understanding of topological interface states.

Contribution

It provides a closed-form analytical condition for interface modes and demonstrates Fermi arc reconstruction at Weyl semimetal junctions using both analytical and numerical methods.

Findings

Fermi arc reconstruction occurs at Weyl semimetal interfaces.

Localized zero-energy modes are stable even with differing Fermi arc connectivities.

Analytical conditions for interface modes are derived using transfer matrix approach.

Abstract

We analyze junctions between noninteracting fermionic topological phases. A closed-form condition for the existence of localized modes at the interface is derived using the transfer matrix approach. These analytical conditions as well as numerical exact diagonalization are used to study interfaces between Weyl semimetals. We observe a Fermi arc reconstruction at the interface, leading to curves of zero energy modes in the interface Brillouin zone. These are stable even in certain cases where the two Weyl semimetals differ only in their Fermi arc connectivities.