$η$-superconductivity in the one-dimensionnal pair hopping model

Details $η$-superconductivity in the one-dimensionnal pair hopping model $η$-superconductivity in the one-dimensionnal pair hopping model

1996-05-26

arxiv.org/abs/cond-mat/9605161v1

Physics

Condensed Matter

the postscript files of the figures are included (5 figures)

Scientific paper

10.1007/s002570050442

Using exact Lanczos diagonalizations we have shown that the pair-hopping
model for {\it negative} $W$ exhibits a phase transition into $\eta$-{\it
superconducting state}. The transition occurs at {\it any band filling} and the
critical value $W_{c}$ varies between $W_{c} \simeq -1.75t$ at half-filling to
$W_{c} \simeq -2t$ for two particles on the lattice.

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