Phase separation and the existence of superconductivity in a one-dimensional copper-oxygen model

Abstract

The phase separation instability occurring with increasing nearest-neighbor repulsion V in a two-band Hubbard model (CuO chain) is discussed. Quantum Monte Carlo simulations indicate that this transition is associated with a level-crossing if the filling fraction is close to 1 (half-filled lower band). Spin-density-wave fluctuations then dominate before phase separation. Superconducting fluctuations dominate only at considerably higher doping levels.

11 pages, RevTex, 5 Postscript figures

References in corpus (1)

• One-Dimensional Fermi liquids

Cited by in corpus (6)

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• Possible Exotic Phases in the One-Dimensional Extended Hubbard Model
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• The incommensurate charge-density-wave instability in the extended three-band Hubbard model
• Superconductivity of the One-Dimensional d-p Model with p-p transfer
• Friedel oscillations in a two-band Hubbard model for CuO chains