Unusually flat hole dispersion relation in the two-dimensional Hubbard model and restoration of coherence by addition of pair-hopping processes

F. F. Assaad*, M. Imada

*この研究の対応する著者

研究成果: Article査読

23 被引用数 (Scopus)

抄録

The dispersion relation of a doped hole in the half-filled 2D Hubbard model is shown to follow a |k|4 law around the (0, ± π) and (±π, 0) points in the Brillouin zone. Upon addition of pair-hopping processes this dispersion relation is unstable towards a |k|2 law. The above follows from T = 0 Quantum Monte-Carlo calculations of the single particle spectral function A(k., ω) on 16 × 16 lattices. We discuss finite dopings and argue that the added term restores coherence to charge dynamics and drives the system towards a dx2-y2 superconductor.

本文言語English
ページ(範囲)595-598
ページ数4
ジャーナルEuropean Physical Journal B
10
4
DOI
出版ステータスPublished - 1999 8 2
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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