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(A) The ground state energy exhibits the characteristic flux dependence of a superconductor, as shown here for V = Δ and six particles on an 8 × 6 lattice. (B)The charge stiffness divided by the Fermi energy is constant in the BCS limit, reaching 1/8 for small doping (gray). (C) Superconducting gap as a function of V/Δ for different doping concentrations. It follows the continuum prediction (dashed line) up to V/Δ ≃ 0.7.
