Exotic edge states of C3 high-fold fermions in honeycomb lattices

Abstract

A generalization of the graphene honeycomb model to the case where each site in the honeycomb lattice contains a $n-$fold degenerate set of eigenstates of the $C_3$ symmetry has been recently proposed to describe several systems, including triangulene crystals and photonic lattices. These generalized honeycomb models are defined by $(n_a,n_b)$, the number $C_3$ eigenstates in the $a$ and $b$ sites of the unit cell, resulting in $n_a+n_b$ bands. Thus, the $(1,1)$ case gives the coventional honeycomb model that describes the two low-energy bands in graphene. Generalizations, such as $(2,1)$, $(2,2)$ and $(3,3)$ display several non-trivial features, such as coexisting graphene-like Dirac cones with flat-bands, both at zero and finite-energy, as well as robust degeneracy points where a flat-band and a parabolic band meet at the $\Gamma$-point. Here, we explore the edge states of this class of crystals, using as reference triangulene crystals, and we find several types of edge states absent in the conventional $(1,1)$ honeycomb case, associated to the non-trivial features of the two-dimensional (2D) bands of the high-fold case. First, we find dispersive edge states associated to the finite-energy flat-bands, that occur both at the armchair and zigzag termination. Second, in the case of non-centrosymmetric triangulene crystals that lead to a $S=1$ Dirac band, we have a bonding-antibonding pair of dispersive edge states, localized in the same edge so that their energy splitting is reduced as their localization increases, opposite to the conventional behavior of pairs of states localized in opposite edges. Third, for the $(3,3)$ case, that hosts a gap separating a pair of flat conduction and valence bands, we find non-dispersive edge states with $E=0$ in all edge terminations.