In a four-site model of real-space pairing, hole-like hopping (t>0) makes the two-hole ground state d-symmetric, implying a d-wave order parameter at low density.
Ogg Jr., Bose-Einstein condensation of trapped electron pairs
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Derivation of d-wave symmetry in real-space superconductors
In a four-site model of real-space pairing, hole-like hopping (t>0) makes the two-hole ground state d-symmetric, implying a d-wave order parameter at low density.