Counter-propagating Fractional Hall states in mirror-symmetric Dirac semi-metals

The Landau bands of mirror symmetric 2D Dirac semi-metals (for example odd-layers of ABA-graphene) can be identified by their parity with respect to mirror symmetry. This symmetry facilitates a new class of counter-propagating Hall states at opposite but equal electron and hole filling factors $\mathrm{\mid }{\nu }_{\pm }\mathrm{\mid }=1\mathrm{/}m$ ({\it m} odd). Here, we propose a Laughlin-like correlated liquid wavefunction, at the charge neutrality point, that exhibits fractionally charged quasi-particle/hole pair excitation of opposite parity. Using a bosonized one-dimensional edge state theory, we show that the longitudinal conductance of this state, ${\sigma }_{xx}=2e^2\mathrm{/}(mh)$, is robust to short-ranged inter-mode interactions.