  We discuss a 1+2 dimensional model with unconventional supersymmetry at the
boundary of an AdS${}_4$, \,$\mathcal{N}$-extended supergravity. The resulting
features of the supersymmetric boundary open the possibility of describing the
electronic properties of graphene-like 2D materials at the Dirac points
\textbf{K} and \textbf{K'}, exploiting a top-down approach. The Semenoff and
Haldane-type masses entering the corresponding Dirac equations can be then
extrapolated from the geometric parameters of the model describing the
substrate.
