Abstract:

We developed a variational mean field theory for strongly correlated electron systems. The theory handles the Mott physics by Gutzwiller projection, and is applicable for unrestricted spin-, charge- and superconductong orders at finite temperatures. This is an important extension to earlier theories that deals with homogeneous and ground state properties. As applications of the theory, we discuss some important issues in high-Tc superconductors. First, we discuss the gap inhomogeneities and the characterist >ics of quasiparticle excitations. Second, we discuss the pseudogap temperature, the superfluid density as a function of doping and temperature, and by combining the KT physics we discuss the superconducting phase diagram.
 
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