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Pseudogaps in the t-J model: Extended DMFT study | K. Haule
; A. Rosch
; J. Kroha
; P. Wölfle
; | Date: |
4 Apr 2003 | Journal: | Phys. Rev. B 68, 155119 (2003). | Subject: | Strongly Correlated Electrons | cond-mat.str-el | 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. | Source: | arXiv, cond-mat/0304096 | Services: | Forum | Review | PDF | Favorites |
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