Nonresonant inelastic light scattering in the Hubbard model

Nonresonant inelastic light scattering in the Hubbard model

Inelastic light scattering from electrons is a symmetry-selective probe of the charge dynamics within correlated materials. Many measurements have been made on correlated insulators, and recent exact solutions in large dimensions explain a number of anomalous features found in experiments. Here we focus on the correlated metal, as described by the Hubbard model away from half filling. We can de...

Sum rules for inelastic light scattering in the Hubbard model

The f-sum rule for the optical conductivity has been known for many years, and has found widespread use in a number of different fields of science. In this contribution, we show how the f-sum rule can be generalized to inelastic light scattering and we explicitly derive the form of the sum rule for the single-band Hubbard model. We discuss evidence that indicates such a sum rule likely holds in...

Interference between resonant and nonresonant inelastic x-ray scattering.

A detailed study of inelastic x-ray scattering from the ground state to the 3Σg(3σ(g)(-1)3s(g)1) state of the O2 molecule is presented. The observed angular anisotropy shows that the vibrational excitations within this final state are strongly dependent on the polarization of the incident radiation. The analysis demonstrates that this is a manifestation of interference between resonant and dire...

Background proportional enhancement of the extended fine structure in nonresonant inelastic x-ray scattering

We report new measurements and calculations of the nonresonant inelastic x-ray scattering NRIXS from Mg and Al for a wide range of momentum transfers, q. Extended oscillations in the dynamic structure factor S q , due to scattering from the 2p and 2s orbitals i.e., L edges are observed out to more than 150 eV past the binding energy. These results are discussed in context of the recently propos...

Inelastic Light Scattering Studies of Borocarbide Superconductors