Effect of dynamical Coulomb correlations on the Fermi surface of Na0.3CoO2 -: art. no. 196401

The t(2g) quasiparticle spectra of Na0.3CoO2 are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transferred from the nearly filled e(g)(') subbands to the a(1g) band, thereby reducing orbital polarization among Co t(2g) states. Dynamical correlations therefore stabilize the small e(g)(') Fermi surface pockets, in contrast to angle-resolved photoemission data, which do not reveal these pockets.