  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.
