期刊论文详细信息
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】
Free