Coupled Fluctuations of SDW with One-Dimensional Quarter-Filled Band : Condensed Matter and Statistical Physics
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概要
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We examine charge and spin fluctuations around the mean-field of a spin density wave (SDW) state with a one-dimensional quarter-filled band by calculating the excitation spectra of collective modes, spectral weights and static susceptibilities. Both the longitudinal and transverse modes are determined by four kinds of coupled fluctuations which result from the four-fold periodic potential of the commensurate SDW. The interplay of the 2k_F-SDW and the 4k_F-CDW appears in the longitudinal fluctuation of both the collective mode and susceptibilities It is shown that the spectral weight of the longitudinal mode with a gap becomes much larger than that of the transverse mode with a gapless excitation when the energy of the on-site repulsive interaction is the same order of magnitude as the band width.
- 理論物理学刊行会の論文
- 1996-11-25
著者
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Suzumura Y
名古屋大 大学院理学研究科
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Tanemura Noriko
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Tanemura Noriko
Department of Physics, Nagoya University
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SUZUMURA Yoshikazu
Department of Physics, Faculty of Science Tohoku University
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