Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-02-25
Phys. Rev. B 67, 075103 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 2 figures
Scientific paper
10.1103/PhysRevB.67.075103
We define Landau quasi-particles within the Gutzwiller variational theory, and derive their dispersion relation for general multi-band Hubbard models in the limit of large spatial dimensions D. Thereby we reproduce our previous calculations which were based on a phenomenological effective single-particle Hamiltonian. For the one-band Hubbard model we calculate the first-order corrections in 1/D and find that the corrections to the quasi-particle dispersions are small in three dimensions. They may be largely absorbed in a rescaling of the total band width, unless the system is close to half band filling. Therefore, the Gutzwiller theory in the limit of large dimensions provides quasi-particle bands which are suitable for a comparison with real, three-dimensional Fermi liquids.
Buenemann Joerg
Gebhard Florian
Thul R.
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