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We review the method of uniqueness which is a powerful technique formulti-loop calculations in higher dimensional theories with conformal symmetry.We use the method in momentum space and show that it allows a very transparentevaluation of a two-loop massless propagator Feynman diagram with a non-integerindex on the central line. The result is applied to the computation of theoptical conductivity of graphene at the infra-red Lorentz invariant fixedpoint. The effect of counter-terms is analysed. A brief comparison with thenon-relativistic case is included.

The method of uniqueness and the optical conductivity of graphene: new application of a powerful technique for multi-loop calculations