  Optical lattices are known for their flexibility to emulate condensed matter
physics and beyond. Based on an early theoretical proposal [Science Bulletin
65, 2080 (2020)], a recent experiment published by Wang et al. [Science 372,
271 (2021)] accomplishes the first experimental realization of topological band
structure of the ideal Weyl semimetal in ultracold atomic matter, prompting
fundamental interest in the context of gapless topological physics. With a neat
design of 3D spin-orbit interaction, the experiment has probed the gapless band
topology through spin texture imaging and quantum quench dynamics. This work
has far reaching implications to topological effects and quantum anomaly in
condensed matter and high energy physics.
