  We theoretically study unattenuated electromagnetic guided wave modes in
centrosymmetric Weyl semimetal layered systems. By solving Maxwell's equations
for the electromagnetic fields and using the appropriate boundary conditions,
we derive dispersion relations for propagating modes in a finite-sized Weyl
semimetal. Our findings reveal that for ultrathin structures, and proper Weyl
cones tilts, extremely localized guided waves can propagate along the semimetal
interface over a certain range of frequencies. This follows from the
anisotropic nature of the semimetal where the diagonal components of the
permittivity can exhibit a tunable epsilon-near-zero response. From the
dispersion diagrams, we determine experimentally accessible regimes that lead
to high energy-density confinement in the Weyl semimetal layer. Furthermore, we
show that the net system power can vanish all together, depending on the Weyl
cone tilt and frequency of the electromagnetic wave.These effects are seen in
the energy transport velocity, which demonstrates a substantial slowdown in the
propagation of electromagnetic energy near critical points of the dispersion
diagrams. Our results can provide guidelines in designing Weyl semimetal
waveguides that can offer efficient control in the velocity and direction of
energy flow.
