Formation of heavy quasiparticle state in two-band Hubbard model

Details Formation of heavy quasiparticle state in two-band Hubbard model Formation of heavy quasiparticle state in two-band Hubbard model

1999-12-13

arxiv.org/abs/cond-mat/9912208v2

Phys. Rev. B62 4403 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.4403

A realization of heavy fermion state is investigated on the basis of two-band Hubbard model. By means of the slave-boson mean-field approximation, it is shown that for the intermediate electron density, n_e=1.5, the inter-band Coulomb repulsion U strongly emphasizes initially small difference between bands, and easily stabilizes integral valence in the lower band. As a result, a strong renormalization takes place in the lower band and the mixing strength between two bands. It gives rise to a sharp peak at the Fermi level in the quasiparticle density of states, as that obtained in the periodic Anderson model. In contrast to a simple insight that the Hund's-rule coupling J reduces the characteristic energy, it turns out to be almost irrelevant to the renormalization for J

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