Pseudogap and Non-Fermi-liquid criticality in double Kondo model for bilayer nickelates
Using single-site dynamical mean-field theory (DMFT) on a double Kondo lattice model of bilayer nickelates, the study maps the phase diagram. It reveals a 'second Fermi liquid' (sFL) pseudogap metal in underdoped regimes, separated from a conventional Fermi liquid by an NFL critical point tuned by interlayer coupling or doping. This suggests strange metal behavior originates from this quantum critical region.