Pseudogaps in the t-J model: An extended dynamical mean-field theory study

摘要: We investigate the highly incoherent regime of hole-doped two-dimensional Mott-Hubbard insulators at moderately small doping $\ensuremath{\delta}$ and temperatures $\ensuremath{\gtrsim}0.1J,$ where J is exchange coupling. Within an extended dynamical mean-field theory $t\ensuremath{-}J$ model a generalized noncrossing approximation we calculate single-particle spectral function, susceptibility, thermodynamic transport quantities. Short-ranged antiferromagnetic fluctuations lead to strongly dynamics, large entropy, electrical resistivity. At low pseudogap found open up in both spin excitation spectra, leading decrease entropy The Hall coefficient changes sign positive values upon lowering level increases inversely proportional $\ensuremath{\delta}.$