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Gauge symmetry in models of high temperature superconductors

Przeszowski J.

Journal of Technical Physics

2001

Vol. 42, no 4

389-396

Gauge symmetry which appears in the slave-mode approach to the t-J model of high temperature superconductivity is presented. The mean field analysis of these microscopic models lead to the continuum gauge field systems with infinitely strong coupling constant. The viability of the perturbative calculations (with finite coupling constant) are illustrated with a particularly simple field theory model. Exact resummation of the perturbation series is discussed for the Heisenberg model of strongly interacting spins in 1 + 1 dimensions which is approximated by the Schwinger model.