<i>W</i>= 0 pairing in Hubbard and related models of low-dimensional superconductors
<i>W</i>= 0 pairing in Hubbard and related models of low-dimensional superconductors
Lattice Hamiltonians with on-site interaction W have W = 0 solutions, that is, many-body singlet eigenstates without double occupation.In particular, W = 0 pairs give a clue to understand the pairing force in repulsive Hubbard models.These eigenstates are found in systems with high enough symmetry, like the square, hexagonal or …