Flat Bands of a Tight-Binding Electronic System with Hexagonal Structure

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概要

• 論文の詳細を見る

• A constructive method to find flat bands is demonstrated for a model describing tight-binding electrons on the hexagonal lattice in which each atomic site has three orbitals. The system may represent σ-electrons of an sp^2-hybridized material but we assume transfer integrals between orbitals to be free parameters for general discussion. Finding highly degenerate eigenfunctions of each flat band is identified as finding a localized eigenfunction, which is determined as a basis function of an irreducible representation of, for example, a point group C_<6v>,. This approach yields not only flat bands on all over the k-space but also some partial flat bands only on a partial k-space. In the former case, if the flat band locates at the bottom (or the top) of a band structure, it is shown that Mielke's condition holds, allowing occurrence of the flat band ferromagnetism.

• 社団法人日本物理学会の論文
• 2003-08-15

著者

• Kuroki K

  Department Of Applied Physics And Chemistry The University Of Electro-communications

• Goda M

  Niigata Univ. Niigata

• Goda Masaki

  Graduate School Of Science And Technology Niigata University

• Goda M

  Graduate School Of Science And Technology Niigata University

• Nishino Shinya

  Graduate School Of Science And Technology Niigata University

• Kusakabe K

  Graduate School Of Engineering Science Osaka University

• KUSAKABE Koichi

  Faculty of Engineering, Niigata University

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