  Weyl semimetal (WSM) is a newly discovered quantum phase of matter that
exhibits topologically protected states characterized by two separated Weyl
points with linear dispersion in all directions. Here, via combining
theoretical analysis and magneto-infrared spectroscopy of an archetypal Weyl
semimetal, niobium phosphide, we demonstrate that the coupling between Weyl
points can significantly modify the electronic structure of a WSM and provide a
new twist to the protected states. These findings suggest that the coupled Weyl
points should be considered as the basis for analysis of realistic WSMs.
