  In this paper, we propose a new analytical model for grounded chiral slab
waveguides covered with graphene sheets. The general waveguide is constructed
of a graphene sheet sandwiched between two different chiral layers (as
substrate and cover layers). The substrate is supposed to be a perfect
electromagnetic conductor (PEMC), which is able to easily convert to a perfect
electric conductor (PEC) or a perfect magnetic conductor (PMC). A novel matrix
representation is obtained for the general structure to find its dispersion
relation and other propagating parameters. To show the richness of the proposed
waveguide, two new structures have been introduced and investigated. It has
been shown that the modal properties of these exemplary structures are tunable
by changing the chemical potential of the graphene and the chirality. The
proposed general structure and its analytical model can be utilized for
designing tunable plasmonic devices in THz frequencies.
