Conservation of chirality at a junction between two Weyl semimetals

TL;DR

This paper explores how the preservation of chirality at junctions between Weyl semimetals can be utilized for valleytronics, highlighting the role of helical iso-spin textures in encoding information.

Contribution

It demonstrates that the chirality of iso-spin textures in Weyl semimetals can be conserved at junctions, enabling potential applications in valleytronics.

Findings

Chirality is conserved at Weyl semimetal junctions.

Iso-spin textures can encode information.

Chirality preservation aids valleytronics applications.

Abstract

In Weyl semimetals the location of linear band crossings, the Weyl cones, is not bound to any high symmetry point of the Brillouin zone, unlike the Dirac nodes in graphene. This flexibility is advantageous for valleytronics, where information is encoded in the valleys of the band structure when intervalley scattering is weak. However, if numerous Weyl cones coexist the encoded information can decohere rapidly because of band mixing. Here, we investigate how the helical iso-spin texture of Weyl cones affects valleytronics in heterojunctions of Weyl materials, and show how the chirality of this iso-spin texture can serve to encode information.