  We investigate the magneto-optical response of double Weyl semimetals whose
energy dispersion is intrinsically anisotropic. We find that in the presence of
a magnetic field, the most salient feature of the optical conductivity is a
series of resonant peaks with the corresponding frequencies scaling linearly
with the strength of the magnetic field. In addition, the optical conductivity
is found to be anisotropic, with two of the three longitudinal components
residing at a linear background and the remaining one at a constant background.
The effects of chemical potential, temperature, impurity scattering, and
particle-hole symmetry breaking on the optical conductivity are also studied.
