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• W2052504236 abstract "We study the spin and charge fluctuations of the extended Hubbard model with on-site interaction $U$ and first neighbor interaction $V$ on the two-dimensional square lattice in the weak to intermediate coupling regime. We propose an extension of the two-particle self-consistent approximation that includes the effect of functional derivatives of the pair-correlation functions on irreducible spin and charge vertices. These functional derivatives were ignored in our previous work. We evaluate them assuming particle-hole symmetry. The resulting theory satisfies conservation laws and the Mermin-Wagner theorem. Our current results are in much better agreement with benchmark quantum Monte Carlo results. This theory allows us to reliably determine the crossover temperatures toward renormalized-classical regimes, and hence, the dominant instability as a function of $U$ and $V$. We have considered fillings $n=1$ and $n=0.75$. Either spin or charge fluctuations can dominate. The wave vector is self-determined by the approach." @default.
• W2052504236 created "2016-06-24" @default.
• W2052504236 creator A5043786584 @default.
• W2052504236 creator A5047325183 @default.
• W2052504236 date "2007-08-13" @default.
• W2052504236 modified "2023-10-17" @default.
• W2052504236 title "Non-perturbative treatment of charge and spin fluctuations in the two-dimensional extended Hubbard model: Extended two-particle self-consistent approach" @default.
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• W2052504236 doi "https://doi.org/10.1103/physrevb.76.085115" @default.
• W2052504236 hasPublicationYear "2007" @default.
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