k-dependent spectrum and optical conductivity near metal-insulator transition in multi-orbital Hubbard bands

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dc.creatorMiura, Oki
dc.creatorFujiwara, Takeo
dc.date2004-12-16
dc.date.accessioned2026-07-07T10:05:02Z
dc.date.available2026-07-07T10:05:02Z
dc.descriptionWe apply the dynamical mean field theory (DMFT) in the iterative perturbation theory(IPT) to doubly degenerate eg bands and triply degenerate tg bands on a simple cubic lattice and calculate the spectrum and optical conductivity in arbitrary electron occupation. The spectrum simultaneously shows the effects of multiplet structure and DMFT together with the electron ionization and affinity levels of different electron occupations, coherent peaks at the Fermi energy in the metallic phase and a gap at an integer filling of electrons for sufficiently large Coulomb U. We also calculate the critical value of the Coulomb U for degenerate orbitals.
dc.description8 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0412423
dc.identifierhttp://arxiv.org/abs/cond-mat/0412423
dc.identifierJ. Phys. Soc. Jpn. 75, 014703 (2006)
dc.identifierdoi:10.1143/JPSJ.75.014703
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169896
dc.subjectStrongly Correlated Electrons
dc.titlek-dependent spectrum and optical conductivity near metal-insulator transition in multi-orbital Hubbard bands
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