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EnglishWe determine the quantum phase diagram of the one-dimensional Hubbard model with bond-charge interaction X in addition to the usual Coulomb repulsion U > 0 at half-filling. For large enough X the model shows three phases. For large U the system is in the spin-density wave phase as 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.
| Titolo: | Incommensurability and unconventional superconductor to insulator transition in the Hubbard model with bond-charge interaction. | |
| Autore/i: | A. A. Aligia; A. Anfossi; L. Arrachea; DEGLI ESPOSTI BOSCHI, CRISTIAN; A. O. Dobry; C. Gaaza; A. Montorsi; ORTOLANI, FABIO; M. E. Torio | |
| Autore/i Unibo: | ||
| Anno: | 2007 | |
| Rivista: | ||
| Abstract: | 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 > 0 at half-filling. For large enough X the model shows three phases. For large U the system is in the spin-density wave phase as 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. | |
| Data prodotto definitivo in UGOV: | 2008-02-26 23:51:24 | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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