Pseudogaps in the t-J model: Extended DMFT study

Details Pseudogaps in the t-J model: Extended DMFT study Pseudogaps in the t-J model: Extended DMFT study

2003-04-04

arxiv.org/abs/cond-mat/0304096v1

Phys. Rev. B 68, 155119 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages, 20 figures

Scientific paper

10.1103/PhysRevB.68.155119

We investigate the highly incoherent regime of hole-doped 2d Mott-Hubbard insulators at moderately small doping and temperatures T>=0.1J, where J is the exchange coupling. Within an extended dynamical mean-field theory of the t-J model and a generalized non-crossing 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 both in the single-particle and the 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 doping.

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