1998/03/31 by C. J. Gazza, C. Gazza, G. B. Martins +4
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat
paper · pdf · doi:10.1103/physrevb.59.r709
published as Phys.Rev. B 59, R709 (1999) · Revised version with new figures. 4 pages, 5 figures
openalex publication_date 1999/01/01 · arxiv created 1999/03/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03
The stability of hole bound states in the t\ensuremath-J model including short-range Coulomb interactions is analyzed using computational techniques on ladders with up to 2\ifmmode×\else\texttimes\fi30 sites. For a nearest-neighbor (NN) hole-hole repulsion, the two-holes bound state is surprisingly robust and breaks only when the repulsion is several times the exchange J. At \ensuremath∼10% hole doping the pairs break only for a NN repulsion as large as V\ensuremath∼4J. Pair-pair correlations remain robust in the regime of hole binding. The results support electronic hole-pairing mechanisms on ladders based on holes moving in spin-liquid backgrounds. Implications in two dimensions are also presented. The need for better estimations of the range and strength of the Coulomb interaction in copper oxides is remarked.