Superconducting gap established on the Fermi arcs near the nodal point (π/2, π/2). The solid line represents the standard d-wave gap function Δ = Δ0 cos2θ, while the dashed and dotted lines show the cases for a real superconducting gap established on the Fermi arc near the nodal point. The superconducting gaps are determined by the value at the terminals of the Fermi arc.
