Strong-coupling formula for momentum-dependent susceptibilities in dynamical mean-field theory

Junya Otsuki, Kazuyoshi Yoshimi, Hiroshi Shinaoka, Yusuke Nomura

研究成果: Article査読

3 被引用数 (Scopus)

抄録

Computing momentum-dependent susceptibilities in the dynamical mean-field theory (DMFT) requires solving the Bethe-Salpeter equation, which demands large computational cost. Exploiting the strong-coupling feature of local fluctuations, we derive a simplified formula that can be solved at a considerably lower cost. The validity and the physical meaning of the formula are confirmed by deriving the effective intersite interactions in the strong-coupling limit, such as the kinetic exchange and RKKY interactions. Furthermore, numerical calculations for single-orbital and multiorbital models demonstrate surprisingly wider applicability including a weak-coupling region. Based on this formula, we propose three levels of practical approximations that can be chosen depending on complexity of problems. Simpler evaluations of spin and orbital susceptibilities in multiorbital systems thus become possible within DMFT.

本文言語English
論文番号165134
ジャーナルPhysical Review B
99
16
DOI
出版ステータスPublished - 2019 4 23

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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