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In this work, we describe a method to realize 3D Weyl semimetal by couplingmultilayers of honeycomb optical lattice in the presence of a pair of Ramanlasers. The Raman lasers render each isolated honeycomb layer a Cherninsulator. With finite interlayer coupling, the bulk gap of the system closesat certain out-of-plane momenta due to Raman assisted tunnelling and result inthe Weyl semimetal phase. Using experimentally relevant parameters, we showthat both one and two pairs of Weyl points can be realized by tuning theinterlayer coupling strength. We suggest that Landau-Zener tunnelling can beused to detect Weyl points and show that the transition probability increasesdramatically when Weyl point emerges. The realization of chiral anomaly byusing a magnetic field gradient is also discussed.

The Realization and Dectection of Weyl Semimetals and Chiral Anomaly in Cold Atomic Systems