Orbital-selective Mott-Hubbard transition in the two-band Hubbard model

Details Orbital-selective Mott-Hubbard transition in the two-band Hubbard model Orbital-selective Mott-Hubbard transition in the two-band Hubbard model

2005-04-02

arxiv.org/abs/cond-mat/0504040v2

Phys. Rev. B 72, 201102(R) (2005)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures; 2nd version as published in Phys. Rev. B (R); minor corrections, putting more emphasis on differences in s

Scientific paper

10.1103/PhysRevB.72.201102

Recent advances in the field of quantum Monte Carlo simulations for impurity problems allow --within dynamical mean field theory-- for a more thorough investigation of the two-band Hubbard model with narrow/wide band and SU(2)-symmetric Hund's exchange. The nature of this transition has been controversial, and we establish that an orbital-selective Mott-Hubbard transition exists. Thereby, the wide band still shows metallic behavior after the narrow band became insulating -not a pseudogap as for an Ising Hund's exchange. The coexistence of two solutions with metallic wide band and insulating or metallic narrow band indicates, in general, first-order transitions.

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