Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-07-31
Phys. Rev. Lett. 99, 256404 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevLett.99.256404
Realistic electronic-structure calculations for correlated Mott insulators are notoriously hard. Here we present an ab initio multiconfiguration scheme that adequately describes strong correlation effects involving Cu 3d and O 2p electrons in layered cuprates. In particular, the O 2p states giving rise to the Zhang-Rice band are explicitly considered. Renormalization effects due to nonlocal spin interactions are also treated consistently. We show that the dispersion of the lowest band observed in photoemission is reproduced with quantitative accuracy. Additionally, the evolution of the Fermi surface with doping follows directly from our ab initio data. Our results thus open a new avenue for the first-principles investigation of the electronic structure of correlated Mott insulators.
Hozoi Liviu
Laad Mukul
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