Doping and temperature dependence of superfluid weight and spectral function: Universal scaling behavior of the pseudogap

Using the improved U(1) and SU(2) slave-boson approaches of the t-J Hamiltonian [S.-S. Lee and Sung-Ho Suck Salk, Phys. Rev. B 64, 052501 (2001)] that we developed recently, we study the doping and temperature dependence of superfluid weight and spectral function and discuss our finding of the universal scaling behavior of the pseudogap. It is shown that at low hole doping concentrations x and at low temperatures T, there exists a propensity of …