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

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

1996-10-07

arxiv.org/abs/cond-mat/9610038v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, RevTeX, 5 figures in PostScript files

Scientific paper

10.1103/PhysRevB.54.R15641

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.

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