Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}CoO_2

Abstract

There exists presently considerable debate over the question whether local Coulomb interactions can explain the absence of the small e'_g Fermi surface hole pockets in photoemission studies of Na_{0.3}CoO_2. By comparing dynamical mean field results for different single particle Hamiltonians and exact diagonalization as well as quantum Monte Carlo treatments, we show that, for realistic values of the Coulomb energy U and Hund exchange J, the e'_g pockets can be slightly enhanced or reduced compared to band structure predictions, but they do not disappear.

arXiv comment4 pages, 2 figures

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• 59Co NMR evidence for charge and orbital order in the kagome like structure of Na2/3CoO2
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• Effective Hamiltonian for transition-metal compounds. Application to Na_xCoO_2
• Dynamical mean field theory of an effective three-band model for Na${}_x$CoO${}_2$
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• Enhancement of the effective disorder potential and the thermopower in Na${}_x$CoO${}_2$ through the electron-phonon coupling