Stripes, pseudogaps, and SO(6) in the cuprate superconductors

This talk will briefly summarize two related calculations. First, we demons trate that the instabilities (either nesting or pairing) associated with th e high-T-c cuprates can be described by an SO(6) transformation group. Ther e are two independent, six-dimensional representations('superspins'). One s uperspin combine, Zhang's five-component superspin with a flux phase instab ility; the other involves a charge density wave, s-wave superconductivity, and an exotic spin current. The second calculation is a self-consistent slave boson calculation, which provides a good description of the doping dependence of the photoemission d ispersion in terms of dynamic striped phases. The stripes are stabilized by strong electron-phonon coupling, and provide evidence for a doping-depende nt crossover between the two superspin groundstates. (C) 1998 Elsevier Scie nce Ltd. All rights reserved.