"Superconductor"-insulator transitions in a Hubbard chain with nearest- neighbor and bond-charge interactions

Details "Superconductor"-insulator transitions in a Hubbard chain with nearest- neighbor and bond-charge interactions "Superconductor"-insulator transitions in a Hubbard chain with nearest- neighbor and bond-charge interactions

1997-12-16

arxiv.org/abs/cond-mat/9712190v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

We consider a half-filled generalized Hubbard chain with electron-hole symmetric correlated hopping and on-site and nearest-neighbor repulsions U and V respectively. In addition to the insulating charge- and spin-density wave phases for large V and U respectively, we identify a phase with dominant superconducting correlations at large distances for small U and V. Using two Berry phases (one associated to the charge and the other to the spin degrees of freedom) as discrete order parameters, we construct a phase diagram for the three thermodynamic phases.

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