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Recently, a new kind of two dimensional (2D) artificial electron lattice,i.e. molecule graphene, has drawn a lots of interest, where the metal surfaceelectrons are transformed into a honeycomb lattice via absorbing a moleculelattice on metal surface. In this work, we would like to point out that thetechnique used to build molecule graphene actually gives a promising way toexplore the interesting physics of other novel 2D lattice beyond graphene. Thekey issue is that this system is an antidot system, where the absorbed moleculenormally gives a repulsive potential. So, we need to establish a map betweenthe molecule arrangement and the desired surface electron lattice. To give aconcrete example, we first analyse the effective models of molecule graphene,and estimate the model parameters for the Cu/CO system through numericalfitting the exerimental data. Then, we design a molecule lattice, and showthat, with this kind of lattice, the surface electrons can be transformed intoa Kagome like lattice. Using the estimated parameters of Cu/CO system, wecalculate the corresponding energy bands and LDOS, which can be readily testedin experiment. We hope that our work can stimulate further theoretical andexperimental interest in this novel artificial 2D electron lattice.

The Effective Model of the Molecule Graphene System and One Application Beyond Graphene