Magnetic Excitations and Electronic Structure in Quantum Materials

Marli Dos Reis Cantarino

European Synchrotron Radiation Facility (ESRF), Grenoble

Quantum materials host a range of emergent electronic and magnetic behaviors arising from the interplay between different degrees of freedom and interactions. Accessing these phenomena often requires probing not only the electronic states, but also the collective excitations that reflect their many-body character.
In the first part of the talk, I will introduce two complementary spectroscopic approaches: Resonant Inelastic X-ray Scattering (RIXS), which allows measurement of phonon, spin, and orbital excitations, and Angle-Resolved Photoemission Spectroscopy (ARPES), which provides direct insight into the electronic structure. The types of questions each technique is particularly well-suited to address and the need for synchrotron radiation will be discussed.
The multi-spectroscopy approach will be illustrated by the example of a doped metallic system, in which magnetic excitations evolve strongly with the disorder introduced by doping. This case study shows how magnetic excitations and electronic states must be understood together when describing the behavior of quantum materials, and how complementary spectroscopies provide a coherent picture of their emergent properties.