Spontaneous Fermi surface deformation in the three-band Hubbard model: A variational Monte Carlo study
arXiv:1301.1012 · doi:10.7566/JPSJ.83.024705
Abstract
We perform a variational Monte Carlo study on spontaneous d-wave form Fermi surface deformation (FSD) within the three-band Hubbard model. It is found that the variational energy of a projected Fermi sea is lowered by introducing an anisotropy between the hopping integrals along the x and y directions. Our results show that the FSD state has the strongest tendency at half-filling in the absence of magnetism, and disappears as the hole concentration increases to . This is qualitatively in agreement with the mean field analysis and the exact diagonalization calculation for the one-band models, and provides a qualitative explanation to the "intra-unit-cell" electronic nematicity revealed by the scanning tunneling microscopy. An analysis of the dependence of FSD on the parameters of the three-band model indicates that the copper on-site Coulomb interaction, the nearest-neighbor copper-oxygen repulsion, and the charge-transfer energy have a remarkable positive effect on FSD.
6 pages, 7 figures
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