Abstract
We show that a simple model of noninteracting quasiparticles accurately describes resonant inelastic x-ray scattering (RIXS) experiments in the hole-doped cuprate superconductors. Band structure alone yields signatures previously attributed to collective magnetic modes, such as the dispersing peaks and nontrivial polarization dependence found in several experiments. We conclude that RIXS data can be explained without positing the existence of magnetic excitations that persist with increasing doping. In so doing we develop a formalism for RIXS in itinerant electron systems that accounts for the positively charged core hole exactly and discover a mechanism by which the core hole produces polarization dependence mimicking that of a magnetic system.
Highlights
We show that a simple model of noninteracting quasiparticles accurately describes resonant inelastic x-ray scattering (RIXS) experiments in the hole-doped cuprate superconductors
In so doing we develop a formalism for RIXS in itinerant electron systems that accounts for the positively charged core hole exactly and discover a mechanism by which the core hole produces polarization dependence mimicking that of a magnetic system
As in experiments we find that NSF line shapes are broader and higher in energy than SF line shapes. These features were previously attributed to magnetic effects, but we find that band structure alone produces dispersing line shapes, while the core hole combines with Pauli blocking to separate SF and NSF line shapes
Summary
We show that a simple model of noninteracting quasiparticles accurately describes resonant inelastic x-ray scattering (RIXS) experiments in the hole-doped cuprate superconductors. Recent resonant inelastic x-ray scattering (RIXS) experiments in hole-doped cuprates [2,3,4] find a peak at energy transfers of ∼200–300 meV that varies little in location and intensity between the undoped and heavily overdoped parts of the phase diagram.
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