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85032428312
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note
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We have not employed the projector QMC method because the negative sign problem becomes too serious.
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30
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0001125548
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In general, the magnitude of V is substantial in transition metal oxides. For example, V ≃ U /4 for cuprates [see, e.g., G. Esirgen, H. B. Schuttler, and N. E. Bickers, Phys. Rev. Lett. 82, 1217 (1999)] and V for Ru 4d are expected to be larger than that for Cu 3d, because 4d orbitals spread more extensively than 3d orbitals.
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3242700653
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Springer, New York
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As discussed by S. Moukouri, C. Huscroft, and M. Jarrell, in Proceedings of the XIIIth Workshop on Recent Developments in Computer Simulation Studies in Condensed Matter Physics (Springer, New York, 2000), DCA gives a reliable result even in purely one-dimensional systems if we take a sufficiently large cluster.
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Moukouri, S.1
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36
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85088490063
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note
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y) is the symmetry considered in [17].
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37
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85032430982
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note
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While it has been shown in Ref. [23] that the sign problem is not serious for nearly half-filled cases, the problem becomes serious for lower densities, especially in the presence of V.
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40
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85032430713
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note
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This is consistent with Ref. [26], i.e., the pairing interaction for triplet pairs can be stronger than that for singlet pairs when V is large enough to make charge fluctuations dominant.
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41
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85088491502
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note
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x2-y2.
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