  In this paper, the asymmetric propagation of electromagnetic waves inside a
two-dimensional air slit cut in an InSb slab is studied. It has been shown that
due to the anisotropic magnetic properties of InSb under a DC magnetic bias,
forward and backward waves show different field patterns inside the air slit.
The proposed waveguide can have potential asymmetric applications in mmWave and
sub-THz regions.
