Superconducting gap for a 2-leg t-J ladder

Details Superconducting gap for a 2-leg t-J ladder Superconducting gap for a 2-leg t-J ladder

2003-03-28

arxiv.org/abs/cond-mat/0303605v1

Phys. Rev. Lett. 91, 137203 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 7 figures

Scientific paper

10.1103/PhysRevLett.91.137203

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.

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