Fermi arc engineering at the interface between two Weyl semimetals

Abstract

We study localized electronic states at the interface between two semi-infinite Weyl semimetals by using a two-band model Hamiltonian. Specifically, we consider cases in which the surface projections of the Weyl nodes of the left system do not coincide with those on the right. We demonstrate that, depending on the position and chirality of the Weyl nodes of both semimetals, the Fermi arcs of the localized interface states can be formed between the surface projection of a Weyl node of the left crystal and the corresponding one of the right crystal, instead of connecting two surface-projected Weyl nodes of the same crystal. Because the resultant interface band disperses toward bulk states of both crystals, this mechanism may provide an efficient transport channel between the two Weyl semimetals comprising the interface.