Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2

Details Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2 Effect of Dynamical Coulomb Correlations on the Fermi Surface of Na_0.3CoO_2

2004-12-23

arxiv.org/abs/cond-mat/0412654v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, to appear in PRL

Scientific paper

10.1103/PhysRevLett.94.196401

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.

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