Fig. 7: Perturbative diagrams from integrating out the photons.
From: Cavity-renormalized quantum criticality in a honeycomb bilayer antiferromagnet
The Feynman diagrams that contribute when integrating out the photons at temperature T = 0 up to order λ4 in the light-matter coupling. Wavy lines correspond to the photon field a, and solid lines to the order parameter field ϕ. The fields interact via the effective interactions Γ1 and Γ2 given in Eq. (7).
