| We present results on the magnetic susceptibility and the spin-wave properties of two-band Hubbard models in two, three, and infinite dimensions. As a method we use the recently developed generalisation of the time-dependent Gutzwiller theory for multi-band models. Our findings are compared with those of a Hartree-Fock based random phase approximation, which is the standard textbook method for the calculation of two-particle response functions. Like in the corresponding ground-state theories we find significant differences between both methods quantitatively as well as qualitatively. |
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