Superconducting gap ratio from strange metal phase in the absence of quasiparticles

Wenhe Cai,Xian-Hui Ge

Figure 1. The relation between the gap Δ and the coupling −5 < K < 1/2 with different S = ⟨Tτσc†Sc†⟩ = 0, 0.01, 0.05 represented by red, purple, dashed respectively. The figure on the left corresponds to the case of U = K = J/2. The figure on the right corresponds to the case of U = K = −J/2. The gap changes abruptly when K goes from negative to zero.