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

K. Haule, A. Rosch, J. Kroha, and P. Wölfle
Phys. Rev. B 68, 155119 – Published 28 October 2003
PDFExport Citation

Abstract

We investigate the highly incoherent regime of hole-doped two-dimensional Mott-Hubbard insulators at moderately small doping δ and temperatures 0.1J, where J is the exchange coupling. Within an extended dynamical mean-field theory of the tJ 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 δ.

  • Received 4 April 2003

DOI:https://doi.org/10.1103/PhysRevB.68.155119

©2003 American Physical Society

Authors & Affiliations

K. Haule1,4, A. Rosch2, J. Kroha3, and P. Wölfle2

  • 1Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019, USA
  • 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 3Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany
  • 4J. Stefan Institute, 1000 Ljubljana, Slovenia

References (Subscription Required)

Click to Expand
Issue

Vol. 68, Iss. 15 — 15 October 2003

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×