Fig. 5: Sublattice-momentum coupling as a driving mechanism for the AFM fluctuations.
From: Flat-band enhanced antiferromagnetic fluctuations and superconductivity in pressurized CsCr3Sb5
a, b Band structures and sublattice projections for CrA in ideal kagome model and downfolded Mz-odd Wannier Hamiltonian of CsCr3Sb5, respectively. c Feynman diagrams for the Dyson series and the pairing vertex of RPA calculations. The locality of the Coulomb interactions is emphasized by the red rectangles. d Schematic illustration for the SMC-driven mechanism of the AFM enhancement in the ideal kagome model: The dominant inter-sublattice correlator at Q = Γ does not appear in the Wick contractions of the local Coulomb interactions, while the intra-sublattice correlator at Q ≠ Γ does.
