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2018 | 133 | 3 | 336-342
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Particle-Hole Symmetry of Charge Excitation Spectra in the Paramagnetic Phase of the Hubbard Model

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Abstracts
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The Kotliar and Ruckenstein slave-boson representation of the Hubbard model allows to obtain an approximation of the charge dynamical response function resulting from the Gaussian fluctuations around the paramagnetic saddle-point in analytical form. Numerical evaluation in the thermodynamical limit yields charge excitation spectra consisting of a continuum, a gapless collective mode with anisotropic zero-sound velocity, and a correlation induced high-frequency mode at ω ≈ U. In this work we show that this analytical expression obeys the particle-hole symmetry of the model on any bipartite lattice with one atom in the unit cell. Other formal aspects of the approach are also addressed.
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  • Normandie University, ENSICAEN, UNICAEN, CNRS, CRISMAT, 14000 Caen, France
  • Normandie University, ENSICAEN, UNICAEN, CNRS, CRISMAT, 14000 Caen, France
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bwmeta1.element.bwnjournal-article-appv133n3p003kz
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