  Discovered in high-energy physics, the chiral anomaly has recently made way
to materials science by virtue of Weyl semimetals (WSM). Thus far, the main
efforts to probe the chiral anomaly in WSM have concentrated on electronic
phenomena. Here, we show that the chiral anomaly can have a large impact in the
$A_1$ phonons of enantiomorphic WSM. In these materials, the chiral anomaly
produces an unusual magnetic-field-induced resonance in the effective phonon
charge, which in turn leads to anomalies in the phonon dispersion, optical
reflectivity, and the Raman scattering.
