Novel Collective Mode in Quarter-Filled SDW States with Next-Nearest-Neighbor Coulomb Interaction
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概要
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The collective modes representing density fluctuation in a spin density wave (SDW) have been examined for a one-dimensional electron system of a quarter-filled extended Hubbard model with the next-nearest-neighbor interaction (V2). Within the random phase approximation (RPA), we obtain a new collective mode, which appears with increasing V2. The mode describes the relative motion between density wave with up spin and that with down spin. The gap in the excitation spectrum vanishes at a critical value of V2 corresponding to the onset of the coexistence of 2kF-SDW, 2kF-charge density wave and 4kF-SDW in the ground state (kF being the Fermi wave vector).
- Physical Society of Japanの論文
- 2001-10-15
著者
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Tomio Yuh
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Suzumura Yoshikazu
Department of Physics, Nagoya University, Nagoya 464-8602
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