Superfluid response in electron-doped cuprate superconductors

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We propose a weakly coupled two-band model with dₓ₂₋y₂ pairing symmetry to account for the anomalous temperature dependence of superfluid density ρₛ in electron-doped cuprate superconductors. This model gives a unified explanation to the presence of a upward curvature in ρₛ near Tc and a weak temperature dependence of ρₛ in low temperatures. Our work resolves a discrepancy in the interpretation of different experimental measurements and suggests that the pairing in electron-doped cuprates has predominately dₓ₂₋y₂ symmetry in the whole doping range.