Spin and charge gaps in the one-dimensional Kondo-lattice model with Coulomb interaction between conduction electrons

Naokazu Shibata, Tomotoshi Nishino

研究成果: Article査読

61 被引用数 (Scopus)

抄録

The density-matrix renormalization-group method is applied to the one-dimensional Kondo-lattice model with the Coulomb interaction between the conduction electrons. The spin and charge gaps are calculated as a function of the exchange constant (Formula presented) and the Coulomb interaction (Formula presented). It is shown that both the spin and charge gaps increase with increasing (Formula presented) and (Formula presented). The spin gap vanishes in the limit of (Formula presented) for any (Formula presented) with an exponential form, (Formula presented). The exponent, (Formula presented), is determined as a function of (Formula presented). The charge gap is generally much larger than the spin gap. In the limit of (Formula presented), the charge gap vanishes as (Formula presented) for (Formula presented) but for a finite (Formula presented) it tends to a finite value, which is the charge gap of the Hubbard model.

本文言語English
ページ(範囲)R8828-R8831
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
53
14
DOI
出版ステータスPublished - 1996
外部発表はい

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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