| Angle resolved photoemission spectroscopy (ARPES) provides a detailed view of the renormalized band structure and, consequently, is a key to the self-energy and the single-particle Green's function. It is explained what precautions need to be taken when extracting these values from the experiment. Then a summary of the ARPES data accumulated over the whole Brillouin zone for the optimally doped Bi2Sr2CaCu2O8-δ is presented as a parametric model of the Green's function. The resulting model is used for calculating the itinerant component of the dynamic spin susceptibility in absolute units with many-body effects taken into account. By comparison with inelastic neutron scattering (INS) data it is shown that the itinerant component of the spin response can account for the integral intensity of the experimental INS spectrum. By taking into account the bi-layer splitting, the magnetic resonances in the acoustic (odd) and optic (even) INS channels are explained. |
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