Abstract
We investigate the highly incoherent regime of hole-doped two-dimensional Mott-Hubbard insulators at moderately small doping and temperatures where J is the exchange coupling. Within an extended dynamical mean-field theory of the model and a generalized noncrossing approximation we calculate the single-particle spectral function, the dynamical susceptibility, and thermodynamic and transport quantities. Short-ranged antiferromagnetic fluctuations lead to strongly incoherent single-particle dynamics, large entropy, and large electrical resistivity. At low doping a pseudogap is found to open up in both the single-particle and spin excitation spectra, leading to a decrease in entropy and resistivity. The Hall coefficient changes sign to positive values upon lowering the doping level and increases inversely proportional to
- Received 4 April 2003
DOI:https://doi.org/10.1103/PhysRevB.68.155119
©2003 American Physical Society