Abstract
We calculate the two-point dynamic response functions of the Hubbard model at any filling from a slave-boson representation in the paramagnetic saddle point approximation. We use a spin-rotation invariant form of the representation due to Kotliar and Ruckenstein, for which the saddle point corresponds to Gutzwiller's variational approximation. In addition to the spin and charge susceptibilities, which have the familiar RPA form in the limit of small wavevectorq, the double and single-occupancy response functions are here calculated for the first time.
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Work partially performed at Department of Physics, University of Florida, Gainesville, FL 32611, USA
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Li, T., Sun, Y.S. & Wölfle, P. Dynamic response functions of Hubbard model in Gutzwiller approximation. Z. Physik B - Condensed Matter 82, 369–374 (1991). https://doi.org/10.1007/BF01357181
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DOI: https://doi.org/10.1007/BF01357181