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We show that fermion charge fractionalization can take place in a recentlyproposed chiral gauge model for graphene even in the absence of Kekul\'edistortion of the graphene honeycomb lattice. We extend the model by adding thecoupling of fermions to an external magnetic field and show that the fermioncharge can be fractionalized by means of only gauge potentials. It is shownthat the chiral fermion charge can also have fractional value. We also relatethe fractionalization of the fermion charge to the parity anomaly in anextended Quantum Electrodynamics which involves vector and vector-axial gaugefields.

Fractional fermion charges induced by vector-axial and vector gauge potentials in planar graphene-like structures