Fate of Weyl semimetals in the presence of incommensurate potentials.

We investigate the effect of an incommensurate potential on Weyl semimetal, which is proposed to be realized in ultracold-atomic systems trapped in three-dimensional optical lattices. For the system without the Fermi arc, we find that Weyl points are robust against the incommensurate potential and the system enters into a metallic phase only when the incommensurate potential strength exceeds a critical value. We unveil the transition by analyzing the properties of wave functions and the density of states as a function of the incommensurate potential strength. We also study the system with Fermi arcs and find that the Fermi arcs are fragile against the incommensurate potential and can be destroyed by a weak incommensurate potential. [ABSTRACT FROM AUTHOR]