Electron correlation and Fermi surface topology of Na$_x$CoO$_2$

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dc.creatorZhou, Sen
dc.creatorGao, Meng
dc.creatorDing, Hong
dc.creatorLee, Patrick A.
dc.creatorWang, Ziqiang
dc.date2005-03-14
dc.date2005-04-28
dc.date.accessioned2026-07-07T03:04:10Z
dc.date.available2026-07-07T03:04:10Z
dc.descriptionThe electronic structure of Na$_x$CoO$_2$ revealed by recent photoemission experiments shows important deviations from band theory predictions. The six small Fermi surface pockets predicted by LDA calculations have not been observed as the associated $e_g^\prime$ band fails to cross the Fermi level for a wide range of sodium doping concentration $x$. In addition, significant bandwidth renormalizations of the $t_{2g}$ complex have been observed. We show that these discrepancies are due to strong electronic correlations by studying the multi-orbital Hubbard model in the Hartree-Fock and strong-coupling Gutzwiller approximation. The quasiparticle dispersion and the Fermi surface topology obtained in the presence of strong local Coulomb repulsion are in good agreement with experiments.
dc.description5 pages, 4 figures, revtex4; minor changes, to be published in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0503346
dc.identifierhttp://arxiv.org/abs/cond-mat/0503346
dc.identifierPhys. Rev. Lett. 94, 206401 (2005)
dc.identifierdoi:10.1103/PhysRevLett.94.206401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26034
dc.subjectStrongly Correlated Electrons
dc.titleElectron correlation and Fermi surface topology of Na$_x$CoO$_2$
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