Numerical Studies on the Hubbard Model and the t-J Model in One- and Two-Dimensions
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概要
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Numerical results obtained from Monte Carlo simulation in the ground state and atfinite temperatures as well as the exact diagonalization and the transfer matrixmethod are reported. Efficiency of the Monte Carlo method in the ground state is examined. Spin, charge and superconducting correlations are investigated for the Hub-bard and the t-J model in one and two dimensions. The momentum distribution inthe one-dimensional Hubbard model shows fermi-liquid-like behavior at least in twoorders of magnitude smaller energy scale than the band width. The short-range incom-mensurate spin correlation is observed and analyzed in the doped Hubbard and the tJ model both in one and two dimensions. In the ground state, the superconductingcorrelation shows the absence of system size dependence in two dimensions at the filling smaller than 0.8 and in one dimension at any filling. The binding energy of two fermions and the spin and charge distortion around an itinerant fermion are also dis-cussed in the t-J and the coupled spin-fermion model.
- 社団法人日本物理学会の論文
- 1989-10-15
著者
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Imada Masatoshi
Department Of Applied Physics University Of Tokyo
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Hatsugai Yasuhiro
Department Of Applied Physics Faculty Of Engineering University Of Tokyo
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Hatsugai Yasuhiro
Department Of Applied Physics Faculty Of Engineering University Of Tokyo:
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