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

Abstract

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.

5 pages, 2 figures

References in corpus (2)

• Thermal Conductivity of superconducting (TMTSF)_2ClO_4: evidence for a nodeless gap
• Optical properties of an effective one-band Hubbard model for the cuprates

Cited by in corpus (7)

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• Electron Localization in the Quantum-Hall Regime
• Phase Diagrams from Topological Transitions: The Hubbard Chain with Correlated Hopping
• Berry phases in superconducting transitions
• Phase diagram of the $t-t^{\prime }-U$ chain at half filling
• Geometric Phase and Quantum Phase Transition : Two-Band Model
• Phase diagram of the extended Hubbard chain with charge-dipole interactions