Strong local pairing on the links of a square lattice can trap Cooper pairs in a flat band, giving zero pair kinetic energy and zero superfluid stiffness in the strong-coupling limit.
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Weak easy-plane anisotropy generates attractive equal-spin p-wave pairing via two-magnon exchange in a 2D half-metal, with λp enhanced to O(1) near the ferromagnetic onset.
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Obstructed Cooper pairs in flat band systems -- weakly-coherent superfluids and exact spin liquids
Strong local pairing on the links of a square lattice can trap Cooper pairs in a flat band, giving zero pair kinetic energy and zero superfluid stiffness in the strong-coupling limit.
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Magnon-Mediated Superconductivity in a 2D Itinerant Ferromagnet with Weak Easy-plane Magnetic Anisotropy
Weak easy-plane anisotropy generates attractive equal-spin p-wave pairing via two-magnon exchange in a 2D half-metal, with λp enhanced to O(1) near the ferromagnetic onset.