Pseudogaps in the t-J model: Extended DMFT study
Abstract
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.
Cite
@article{arxiv.cond-mat/0304096,
title = {Pseudogaps in the t-J model: Extended DMFT study},
author = {K. Haule and A. Rosch and J. Kroha and P. Wölfle},
journal= {arXiv preprint arXiv:cond-mat/0304096},
year = {2009}
}
Comments
20 pages, 20 figures