SPIN GAP AND SUPERCONDUCTIVITY IN THE ONE-DIMENSIONAL T-J MODEL WITH COULOMB REPULSION

Article

关键词: VALENCE-BOND STATE;    CRITICAL EXPONENTS;    PHASE-SEPARATION;    HUBBARD-MODEL;    FERMI GAS;    OXIDES;    SCATTERING;    CU;   

DOI  :  10.1103/PhysRevB.48.4002

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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