  Broken symmetry and tilting effects are ubiquitous in Weyl semimetals (WSMs).
Therefore, it is crucial to understand their impacts on the materials'
electronic and optical properties. Here, using a realistic four-band model for
WSMs that incorporates both the symmetry breaking and tilting effects, we study
its Landau quantization and the associated magneto-absorption spectrum. We show
that the Landau levels in tilted Weyl bands can be obtained by considering a
non-tilt Hamiltonian through Lorentz boost. However, broken symmetry effects
can generate an additional term in the Hamiltonian, which equivalently leads to
band reconstruction. Our work provides a more realistic view of the magnetic
field response of WSMs that shall be taken into account in relevant future
device applications.
