Recent Results in the Context of Models for Ladders

摘要: Recent calculations in the context of ladder systems, but with implications also for high-Tc two-dimensional (2D) are described here. In particular, efforts concentrated on influence a hole-hole electrostatic repulsion holepair binding t−J model ladders. It is concluded that pairs very robust because nearest-neighbor strength ~5J needed to break pairs. second part paper, spectral function holes provided up 2×20 clusters using new numerical technique. A gap spectrum caused by hole observed, as well flat regions near (π, 0). Implications studies materials discussed.