Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2
arXiv:cond-mat/0412654 · doi:10.1103/PhysRevLett.94.196401
Abstract
The t2g quasi-particle spectra of Na_0.3CoO_2 are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transfered from the nearly filled e_g' subbands to the a_1g band, thereby reducing orbital polarization among Co t2g 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.
4 pages, to appear in PRL