Does Simple Two-Dimensional Hubbard Model Account for High-T_c Superconductivity in Copper Oxides?(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We reexamine whether the essence of high-T_c superconductivity is contained in doped Hubbard models on the square lattice by using recently developed pre-projected Gaussian-basis Monte Carlo method. The superconducting correlations of the d_<x^2-y^2> wave symmetry in the ground state at distance r decays essentially as r^<-3>. The upper bound of the correlation at long distances estimated by this unbiased method is 10^<-3>, indicating that recent extensions of dynamical mean-field theories and variational methods yielded at least an order of magnitude overestimates of it. The correlations are too weak for the realistic account of the cuprate high-T_c superconductivity.
- 社団法人日本物理学会の論文
- 2007-11-15
著者
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IMADA Masatoshi
Department of Applied Physics, University of Tokyo
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Imada Masatoshi
Department Of Applied Physics University Of Tokyo
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AIMI Takeshi
Department of Physics, University of Tokyo
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Aimi Takeshi
Department Of Physics University Of Tokyo
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