Spin gap and superconductivity in the one-dimensional t-J model with Coulomb repulsion
M. Troyer, H. Tsunetsugu, T. M. Rice, J. Riera, E. Dagotto
DOI 10.1103/PhysRevB.48.4002 · Physical Review B
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Abstract
The one-dimensional t-J model with density-density repulsive interactions is investigated with the use of exact-diagonalization and quantum Monte Carlo methods. A short-range repulsion pushes phase separation to larger values of J/t, and leads to a widened precursor region in which a spin gap and strengthened superconducting correlations appear. The correlation exponent is calculated. On the contrary, a long-range repulsion of form 1/r suppresses superconductivity in the precursor region.
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