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
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Kuroki K
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Goda M
Niigata Univ. Niigata
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Goda Masaki
Graduate School Of Science And Technology Niigata University
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Goda M
Graduate School Of Science And Technology Niigata University
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Nishino Shinya
Graduate School Of Science And Technology Niigata University
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Kusakabe K
Graduate School Of Engineering Science Osaka University
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KUSAKABE Koichi
Faculty of Engineering, Niigata University
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