Abstract
The two-loop interaction correction coefficient to the universal ac conductivity of disorder-free intrinsic graphene is computed with the help of a field theoretic renormalization study using the Bogoliubov-Parasiuk-Hepp-Zimmermann prescription. Non-standard Ward identities imply that divergent subgraphs (related to Fermi velocity renormalization) contribute to the renormalized optical conductivity. Proceeding either via densitydensity or via current-current correlation functions, a single well-defined value is obtained: \( \mathcal{C}=\left.\left(19-6\pi \right)/12\right)=0.01 \) in agreement with the result first obtained by Mishchenko and which is compatible with experimental uncertainties.
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Teber, S., Kotikov, A.V. Field theoretic renormalization study of interaction corrections to the universal ac conductivity of graphene. J. High Energ. Phys. 2018, 82 (2018). https://doi.org/10.1007/JHEP07(2018)082
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DOI: https://doi.org/10.1007/JHEP07(2018)082