  Weyl semimetals are a new paradigmatic topological phase of matter featuring
a gapless spectrum. One of its most distinctive features is the presence of
Fermi arc surface states. Here, we report on atomistic simulations of the dc
conductance and quantum Hall response of a minimal Weyl semimetal. By using
scattering theory we show that a quantized Hall conductance with a
non-vanishing longitudinal conductance emerges associated to the Fermi arc
surface states with a remarkable robustness to high concentrations of defects
in the system. Additionally, we predict that a slab of a Weyl semimetal with
broken time-reversal symmetry bears persistent currents fully determined by the
system size and the lattice parameters.
