Applicability of the slave-boson method for calculating the electronic structure of multiband systems with strong Coulomb correlations
Elesin V. F. , Opyonov L A. , Kholmovskii E. G. , Molotkov S. N. , Nazin S. S.
Calculations of the electronic structure of strongly correlated systems carried out by the slave-boson method are compared with exact numerical solutions for finite clusters. The "slave-boson" method is found to be a very good approximation for studying not only the single-band Hubbard model but also multiband Hubbard models. It yields the characteristics of the ground state within an error —1%. The reasons for the large discrepancy observed previously [S. N. Molotkov et al., JETP Lett. 59, 847 (1994)] between the slave-boson results and the exact solution are identified. © 1995 American Institute of Physics.
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![](/ps/1210/article_18298_800_head.png "Calculations of the electronic structure of strongly correlated systems carried out by the slave-boson method are compared with exact numerical solutions for finite clusters. The "slave-boson" method is found to be a very good approximation for studying not only the single-band Hubbard model but also multiband Hubbard models. It yields the characteristics of the ground state within an error —1%. The reasons for the large discrepancy observed previously [S. N. Molotkov <i>et al., </i>JETP Lett. 59, 847 (1994)] between the slave-boson results and the exact solution are identified. © <i>1995 American Institute of Physics.</i>")