Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-24
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 8 figures, 2 tables, slightly extended
Scientific paper
We investigate an extended version of the periodic Anderson model with the aim to understand the role of interaction between the conduction electrons forming the broad band. Two methods are used: (i) variational calculation with the Gutzwiller wave function and (ii) exact diagonalization. The former is carried out for a wide range of the parameters in the Hamiltonian optimizing numerically the ground-state energy. The latter is performed on a chain of four to six sites. The f-level occupancy and the renormalization factor of the quasiparticles are calculated as a function of the energy of the f-orbital. The results of the two methods are in reasonably good agreement with each other. We find that owing to the interaction between the conduction electrons a heavy-fermion state of f-electrons is realized even if the f-level does not lie deep below the conduction band.
Hagymási I.
Itai K.
Sólyom Jeno
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