Case Studies of Quantum Materials via RIXS

Quantum materials exhibit extraordinary properties stemming from the interplay of different degrees of freedom, encompassing quantum topology, orbital, spin, lattice, and charge interactions. However, comprehending and manipulating these underlying degrees of freedom presents a substantial challenge. Resonant inelastic X-ray scattering (RIXS) has emerged as a powerful technique for studying elementary excitations associated with these fundamental degrees of freedom, including orbital, magnon, phonon, and charge excitations, in the energy-momentum domain. This capability offers great opportunities to unravel the intricate phenomena exhibited by quantum materials.<br/><br/>In particular, the recent advancements in X-ray free-electron laser have heralded a new era of time-resolved RIXS, enabling the measurement of elementary excitations when they are driven out of equilibrium. In this presentation, I will showcase our latest investigations employing RIXS and time-resolved RIXS on unconventional superconductors and related compounds. Our findings highlight how RIXS can illuminate the microscopic behaviors, thereby contributing to a broader understanding and potential control of quantum materials.