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

Waveguide Modes in Weyl Semimetals with Tilted Dirac Cones