Superconducting gap for a 2-leg t-J ladder
arXiv:cond-mat/0303605 · doi:10.1103/PhysRevLett.91.137203
Abstract
Single-particle diagonal and off-diagonal Green's functions of a 2-leg t-J ladder at 1/8-doping are investigated by Exact Diagonalisations techniques. A numerically tractable expression for the superconducting gap is proposed and the frequency dependence of the real and imaginary parts of the gap are determined. The role of the low-energy gapped spin modes whose energies are computed by a (one-step) Contractor Renormalization procedure are discussed.
3 pages, 7 figures