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

doi:10.1007/s100510050891

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

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 d_x2-y2 superconductor.

Original language	English
Pages (from-to)	595-598
Number of pages	4
Journal	European Physical Journal B
Volume	10
Issue number	4
DOIs	https://doi.org/10.1007/s100510050891
Publication status	Published - 1999 Aug 2
Externally published	Yes

Keywords

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

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10.1007/s100510050891

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abstract = "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.",

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AU - Assaad, F. F.

AU - Imada, M.

PY - 1999/8/2

Y1 - 1999/8/2

N2 - 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.

AB - 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.

KW - 71.10.Fd lattice fermion models (Hubbard model, etc.)

KW - 71.30.+h Metal-insulator transitions and other electronic transitions

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

Abstract

Keywords

ASJC Scopus subject areas

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