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Following the recent realization of an artificial version of Graphene in theelectronic surface states of copper with judiciously placed carbon monoxidemolecules inducing the honeycomb lattice symmetry (K. K. Gomes et al., Nature483, 306 (2012)), we demonstrate that these can be used to realize a vortex ina Kekule texture of the honeycomb lattice. The Kekule texture is mathematicallyanalogous to a superconducting order parameter, opening a spectral gap in themassless Dirac point spectrum of the Graphene structure. The core of a vortexin the texture order parameter, supports subgap states, which for this systemare analogs of Majorana fermions in some superconducting states. In particular,the electron charge bound to a single vortex core is effectively fractionalizedto a charge of $e/2$. The Kekule texture as realized in the molecular Graphenesystem realizes 3 different domain types, and we show that a Y-junction betweenthem realizes the coveted Kekule vortex.

Realization of a vortex in the Kekule texture of molecular Graphene, at a Y junction where 3 domains meet