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.

4 pages, 2 figures

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Cited by in corpus (6)

• The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic
• Multisite versus multiorbital Coulomb correlations studied within finite-temperature exact diagonalization dynamical mean-field theory
• Dynamical mean field theory of an effective three-band model for Na${}_x$CoO${}_2$
• The electronic structure of the Na${}_x$CoO${}_2$ surface
• The origin of a${}_{1g}$ and e${}_g$' orderings in Na${}_x$CoO${}_2$
• Enhancement of the effective disorder potential and the thermopower in Na${}_x$CoO${}_2$ through the electron-phonon coupling