The method of uniqueness and the optical conductivity of graphene: New application of a powerful technique for multiloop calculations

@article{Teber2016TheMO,
  title={The method of uniqueness and the optical conductivity of graphene: New application of a powerful technique for multiloop calculations},
  author={S. Teber and Anatoly V. Kotikov},
  journal={Theoretical and Mathematical Physics},
  year={2016},
  volume={190},
  pages={446-457}
}
We briefly review the uniqueness method, which is a powerful technique for calculating multiloop Feynman diagrams in theories with conformal symmetries. We use the method in the momentum space and show its effectiveness in calculating a two-loop massless propagator Feynman diagram with a noninteger index on the central line. We use the obtained result to compute the optical conductivity of graphene at the infrared Lorentz-invariant fixed point. We analyze the effect of counterterms and compare… 
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