  We theoretically study the electromagnetic response of type-I and type-II
centrosymmetric Weyl semimetals. We derive an anisotropic permittivity tensor
with off-diagonal elements to describe such gyrotropic media. Our findings
reveal that for appropriate Weyl cones tilts, the real part of the transverse
component of the permittivity can exhibit an epsilon-near-zero response. The
tilt parameter can also control the amount of loss in the medium, ranging from
lossless to dissipative when transitioning from type-I to type-II. Similarly,
by tuning either the frequency of the electromagnetic field or the chemical
potential in the system, an epsilon-near-zero response can appear as the
permittivity of the Weyl semimetal transitions between positive and negative
values. Employing the obtained permittivity tensor, we consider a setup where
the Weyl semimetal is deposited on a perfect conductive substrate and study the
refection and absorption characteristics of this layered configuration. We show
that by choosing the proper geometrical and material parameters, devices can be
created that perfectly absorb electromagnetic energy over a wide angular range
of incident electromagnetic waves.

Strongly Correlated Electrons;Optics