2005/04/30 by Ryotaro Arita, R. Arita, Karsten Held +1 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.72.201102
published as Phys. Rev. B 72, 201102(R) (2005) · 4 pages, 3 figures; 2nd version as published in Phys. Rev. B (R); minor corrections, putting more emphasis on differences in spectra when comparing SU(2) and Ising Hund's exchange
openalex publication_date 2005/11/29 · arxiv created 2006/01/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 a 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. 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 a metallic wide band and an insulating or metallic narrow band indicates, in general, first-order transitions.