k-Dependent Spectrum and Optical Conductivity near Metal-Insulator Transition in Multi-Orbital Hubbard Bands(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We apply the dynamical mean field theory (DMFT) combined with the iterative perturbation theory (IPT) to the doubly degenerate e_g and the triply degenerate t_<2g> bands on a simple cubic lattice and a body-centered cubic lattice and calculate the spectrum and optical conductivity in arbitrary electron occupation. The spectrum simultaneously shows the effects of multiplet structure together with the electron ionization and affinity levels of different electron occupations, coherent peaks at the Fermi energy in the metallic phase and an energy gap at an integer filling of electrons for sufficiently large Coulomb U. We also discuss the critical value of the Coulomb U for degenerate orbitals on a simple cubic lattice and a body-centered cubic lattice.

収録刊行物

  • Journal of the Physical Society of Japan   [巻号一覧]

    Journal of the Physical Society of Japan 75(1), "014703-1"-"014703-8", 2006-01-15  [この号の目次]

    一般社団法人日本物理学会

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各種コード

  • NII論文ID(NAID)
    10018807796
  • NII書誌ID(NCID)
    AA00704814
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00319015
  • NDL 記事登録ID
    7772214
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A404
  • データ提供元
    CJP書誌  NDL  NII-ELS  JPS 
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