  Although Weyl semimetals have been extensively studied for exploring rich
topological physics, the direct observation of the celebrated chiral magnetic
effect (CME) associated with the so-called dipolar chiral anomaly has long
intrigued and challenged physicists, still remaining elusive in nature. Here we
propose a feasible scheme for experimental implementation of ultracold atoms
that may enable us to probe the CME with a pure topological current in an
artificial Weyl semimetal. The paired Weyl points with the dipolar chiral
anomaly emerge in the presence of the well-designed spin-orbital coupling and
laser-assisted tunneling. Both of the two artificial fields are readily
realizable and highly tunable via current optical techniques using ultracold
atoms trapped in three-dimensional optical lattices, providing a reliable way
for manipulating Weyl points in the momentum-energy space. By applying a weak
artificial magnetic field, the system processes an auxiliary current originated
from the topology of a paired Weyl points, namely, the pure CME current. This
topological current can be extracted from measuring the center-of-mass motion
of ultracold atoms, which may pave the way to directly and unambiguously
observe the CME in experiments.
