Abstract
Based on a single-band Hubbard model and the fluctuation exchange approximation, the effective mass and the energy band renormalization in ${\mathrm{Na}}_{0.33}\mathrm{Co}{\mathrm{O}}_{2}$ is elaborated. The renormalization is observed to exhibit certain kind of anisotropy, which agrees qualitatively with the angle-resolved photoemission spectroscopy measurements. Moreover, the spectral function and density of states in the normal state are calculated, with a weak pseudogap behavior being seen, which is explained as a result of the strong Coulomb correlations. Our results suggest that the large Fermi surface associated with the ${a}_{1g}$ band plays likely a central role in the charge dynamics.
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