Effect of the Three-Site Hopping Term on the t-J Model

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dc.creatorAmmon, Beat
dc.creatorTroyer, Matthias
dc.creatorTsunetsugu, Hirokazu
dc.date1995-02-09
dc.date.accessioned2026-07-07T06:29:18Z
dc.date.available2026-07-07T06:29:18Z
dc.descriptionWe have used exact diagonalization and quantum Monte Carlo methods to study the one-dimensional {t-J} model including the three-site hopping term derived from the strong coupling limit of the Hubbard model. The three-site term may be important to superconducting correlations since it allows direct hopping of local singlet electron pairs. The phase diagram is determined for several values of the strength of the three-site term and compared with that of the {t-J} and Hubbard models. Phase separation, which exists in the t-J model is suppressed. In the low electron density region the formation of local singlet electron pairs is enhanced, leading to stronger superconducting correlations even for values $J/t<2$. A large spin gap region extends from low electron densities up to high densities. In the low hole density region the superconducting correlations are suppressed at $J/t>2.8$ in spite of enhanced pair formation. This is because the three-site term, while enhancing the formation of electron pairs, leads to a repulsion between holes.
dc.description9 pages including 9 figures and 1 Table. Self-unpacking postscript. Unpacking instructions are at the beginning of the file. Submitted to Physical Review B
dc.identifierhttps://arxiv.org/abs/cond-mat/9502037
dc.identifierhttp://arxiv.org/abs/cond-mat/9502037
dc.identifierPhys. Rev. B 52, 000629 (1995)
dc.identifierdoi:10.1103/PhysRevB.52.629
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97982
dc.subjectCondensed Matter
dc.titleEffect of the Three-Site Hopping Term on the t-J Model
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