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

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

2007-05-24

arxiv.org/abs/0705.3627v1

Eur. Phys. J. B 61, 405-411 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1140/epjb/e2008-00108-y

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.

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