Condensed Matter Physics Seminar

A newly developed theory is presented for dealing with Gutzwiller projected electrons- in the context of the t-J model. The method uses Schwinger's ideas to bypass the difficulties arising from the  non-canonical Gutzwiller projected electrons that make the  Feynman series  useless. In applying these ideas to the t-J model, one generically finds a Fermi liquid ground state, but with large corrections to the Landau theory  asymptotic behavior. We obtain the quasiparticle decay rate

Im{S(w,T)} = c (w² + T²) (1- w/w₀) + …                      (S = Sigma, w = omega)

so that the particle hole symmetry is violated by the odd in "w" term with a rather small w₀ energy scale.

By way of applications of the theoretical methodology, I present comparisons with the ARPES lines shapes, dispersion curves and the kinks in the spectrum at optimal and slightly overdoped limits of the cuprates.  An excellent fit with data is found, and also interesting predictions for future experiments are made.