Incommmensurability and unconventional superconductor to insulator transition in the Hubbard model with bond-charge interaction

Details Incommmensurability and unconventional superconductor to insulator transition in the Hubbard model with bond-charge interaction Incommmensurability and unconventional superconductor to insulator transition in the Hubbard model with bond-charge interaction

2007-04-05

arxiv.org/abs/0704.0717v2

Phys. Rev. Lett. 99, 206401 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.206401

We determine the quantum phase diagram of the one-dimensional Hubbard model with bond-charge interaction X in addition to the usual Coulomb repulsion U at half-filling. For large enough X and positive U the model shows three phases. For large U the system is in the spin-density wave phase already known in the usual Hubbard model. As U decreases, there is first a spin transition to a spontaneously dimerized bond-ordered wave phase and then a charge transition to a novel phase in which the dominant correlations at large distances correspond to an incommensurate singlet superconductor.

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