Abstract
Momentum-dependent excitation spectra of the two-dimensional Hubbard model on a square lattice have been investigated at zero temperature on the basis of the full self-consistent projection operator method in order to clarify nonlocal effects of electron correlations on the spectra. Intersite antiferromagnetic correlations are found to cause shadow bands and enhance the Mott-Hubbard splittings near the half-filling. Furthermore, nonlocal excitations are shown to move the critical doping concentration δ h *, at which the singular quasiparticle peak is located just on the Fermi level, from δ h * = 0.153 (the single-site value) to δ h * = 0.123. The latter suggests the occurrence of an instability such as the stripe at δ h * = 1/8.
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Kakehashi, Y., Atiqur, M., Patoary, R. et al. Nonlocal excitations and 1/8 singularity in cuprates. Journal of the Korean Physical Society 62, 1827–1831 (2013). https://doi.org/10.3938/jkps.62.1827
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DOI: https://doi.org/10.3938/jkps.62.1827