Superconducting Correlation of Two-Dimensional Hubbard Model near Half-Filling
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概要
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Superconducting correlation of the Hubbard model on a square lattice isreinvestigated by quantum Monte Carlo method. Results from more than one orderof magnitude larger Monte Carlo steps than before are presented to discuss the convergence of the data to the ground state. By examining the dependence on the choiceof initial trial states as well as on the Trotter number in detail, the superconductingcorrelation in the ground state is reliably obtained up to 12 X 12 lattice away from thehalf-filling and up to 16 X 16 lattice at the half-filling, which substantially improveformer results near the half-filling. Various channels of pairing in the ground stateshow no system size dependence and remain quite short ranged at any filling includingthe region close to the half-filling. Numerical data show further evidence that neitherextended .5- nor d-wave superconducting state is possible in the two-dimensional Hu b-bard model.
- 社団法人日本物理学会の論文
- 1991-08-15
著者
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Imada Masatoshi
Institute For Solid State Physics University Of Tokyo
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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