d-wave spin density wave phase in the attractive Hubbard model with spin polarization

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  • Tamaki Hiromasa
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Miyake Kazumasa
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Ohashi Yoji
    Faculty of Science and Technology, Keio University CREST(JST)

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タイトル別名
  • <I>d</I>-Wave Spin Density Wave Phase in the Attractive Hubbard Model with Spin Polarization

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説明

We investigate the possibility of an unconventional spin density wave (SDW) in the attractive Hubbard model with finite spin polarization. We show that pairing and density fluctuations induce a transverse d-wave SDW near the half-filling. This novel SDW is related to the d-wave superfluidity induced by antiferromagnetic spin fluctuations, in the sense that they are connected with each other through Shiba’s attraction–repulsion transformation. Our results predict the d-wave SDW in real systems, such as cold Fermi atom gases with a population imbalance and compounds involving valence skipper elements.

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