| The Spectrum of Four-Point Hubbard Model with Holes |
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| 摘 要： | The spectra of four-point Hubbard model with oneand two holes are given. The analytic results are com-pared with those of t-J and t-t'-J models. For one-holecase there exists a phase transition in the groundstate.The transition point is at t/U = 0. 054.
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