<b>k</b>-Dependent Spectrum and Optical Conductivity near Metal–Insulator Transition in Multi-Orbital Hubbard Bands

• Miura Oki

  Department of Applied Physics, University of Tokyo

• Fujiwara Takeo

  Department of Applied Physics, University of Tokyo

書誌事項

タイトル別名

• k-Dependent Spectrum and Optical Conductivity near Metal–Insulator Transition in Multi-Orbital Hubbard Bands

抄録

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

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (1), 014703-, 2006

  一般社団法人 日本物理学会

キーワード

• strongly correlated electron systems
• dynamical mean field theory
• iterative perturbation theory
• local density approximation
• metal–insulator transition

詳細情報

• CRID: 1390001204189875584
• NII論文ID: 130004806872
• NII論文ID: 110003482835
• NII論文ID: 210000105961
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.014703
• BIBCODE: 2006JPSJ...75a4703M
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7772214
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7772214
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.014703
• 本文言語コード: en
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