Quantum Monte Carlo study of the pairing correlation in the Hubbard ladder

Abstract

An extensive Quantum Monte Carlo calculation is performed for the two-leg Hubbard ladder model to clarify whether the singlet pairing correlation decays slowly, which is predicted from the weak-coupling theory but controversial from numerical studies. Our result suggests that the discreteness of energy levels in finite systems affects the correlation enormously, where the enhanced pairing correlation is indeed detected if we make the energy levels of the bonding and anti-bonding bands lie close to each other at the Fermi level to mimic the thermodynamic limit.

10 pages, RevTeX, 5 figures in PostScript files

References in corpus (14)

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• Correlations in a two--chain Hubbard model
• Phases of two coupled Luttinger liquids
• Pairing and Excitation Spectrum in doped t-J Ladders
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• Spin Gap Fixed Points in the Double Chain Problem
• Luttinger liquid behaviour and superconducting correlations in t-J ladders
• The Doped Two Chain Hubbard Model
• Singlet Stripe Phases in the planar t-J Model
• Singlet pairing in the double chain t-J model
• Chiral Anomaly and Spin Gap in One-Dimensional Interacting Fermions
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