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• W2086362807 abstract "We present a generalization of the recently proposed variational cluster perturbation theory to extended Hubbard models at half-filling with repulsive nearest neighbor interaction. The method takes into account short-range correlations correctly by the exact diagonalization of clusters of finite size, whereas long-range order beyond the size of the clusters is treated on a mean-field level. For one dimension, we show that quantum Monte Carlo and density-matrix renormalization-group results can be reproduced with very good accuracy. Moreover we apply the method to the two-dimensional extended Hubbard model on a square lattice. In contrast to the one-dimensional case, a first order phase transition between spin density wave phase and charge density wave phase is found as function of the nearest-neighbor interaction at onsite interactions $Uensuremath{geqslant}3t$. The single-particle spectral function is calculated for both the one-dimensional and the two-dimensional system." @default.
• W2086362807 created "2016-06-24" @default.
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• W2086362807 date "2004-12-03" @default.
• W2086362807 modified "2023-09-29" @default.
• W2086362807 title "Charge ordering in extended Hubbard models: Variational cluster approach" @default.
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• W2086362807 doi "https://doi.org/10.1103/physrevb.70.235107" @default.
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