Role of Interlayer Electron Hopping for Spin Density Wave State in the Zero-Gap Organic Conductor(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We investigate the formation of density waves in the zero-gap state (ZGS) which has been found in the quasi-two-dimensional organic conductor α-(BEDT-TTF)_2I_3 salt under the hydrostatic pressure. The ZGS exhibits the cone-like dispersion for both the conduction band and the valence band which degenerate each other at the two-dimensional wave vectors, ±k_0 forming a zero gap. By using the extended Hubbard model with repulsive interaction we calculate the onset temperature of the spin density wave (SDW) as a function of the interlayer electron hopping, which by itself does not break the cone-like dispersion. It is shown that the SDW with wave number 2k_0 is induced by the combined effect of the interaction, the interband excitation across the zero-gap and the interlayer hopping.
- 社団法人日本物理学会の論文
- 2008-01-15
著者
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Suzumura Y
名古屋大 大学院理学研究科
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SUZUMURA Yoshikazu
Department of Physics, Nagoya University
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Kobayashi A
Institute For Advanced Research Nagoya University
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Kobayashi A
Department Of Physics Division Of Material Science Nagoya University
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Kobayashi Akito
Department Of Physics Nagoya University
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KATAYAMA Shinya
Department of Physical Electronics, Tokyo Institute of Technology
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Katayama Shinya
Department Of Physics Nagoya University
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Katayama Shinya
Department Of Physical Electronics Tokyo Institute Of Technology:(present Address)nippon Sheet Glass
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KOBAYASHI Akito
Institute for Advanced Research, Nagoya University
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Suzumura Yoshikazu
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Kobayashi Akito
Institute For Advanced Research Nagoya University:department Of Physics Nagoya University
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