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

F. F. Assaad, Masatoshi Imada

Research output: Contribution to journalArticle

23 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)595-598
Number of pages4
JournalEuropean Physical Journal B
Issue number4
Publication statusPublished - 1999 Aug 2
Externally publishedYes



  • 71.10.Fd lattice fermion models (Hubbard model, etc.)
  • 71.30.+h Metal-insulator transitions and other electronic transitions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this