\documentclass{standalone}
\usepackage{tikz}

% macros to draw graphene lattices
\usepackage{graphene}

\begin{document}
\begin{tikzpicture}

\graphene{(0,0)}{}

\sitelattice{a}{(0,0)}{}
\sitelattice{b}{(0,0)}{}

\end{tikzpicture}
\end{document}
