Fig. 4: Energy scale of the gap and spectral weight redistribution.
From: Electronic correlations and partial gap in the bilayer nickelate La3Ni2O7
a The frequency-dependent spectral weight ratio S(200K)/S(300K) (red curve) and S(5K)/S(125K) (blue curve). b The difference optical conductivity Δσ1(ω) at 5 K. The arrow indicates the zero-crossing point in Δσ1(ω) which corresponds to the gap energy 2Δ. c–e The evolution of the spectral weight as a function of temperature for cutoff frequencies ωc = 600 cm−1, ωc = 1000 cm−1 and ωc = 6500 cm−1. f The evolution of Δ with temperature (red open circles). The blue solid line denotes the mean-field behavior.
