Superconductivity

My superconductivity research spans two complementary directions. In the nickelates, the discovery of superconductivity in thin films has renewed interest in the rare-earth series RENiO₃ and the complex interplay of charge transfer, bond disproportionation, and electron correlations that drive their metal-insulator transitions. Using RIXS across nine compounds in the series, combined with Wannier orbital calculations and exact diagonalization modeling, we extract the energy scales governing the MIT — charge transfer gaps, hopping integrals, and crystal-field splittings — providing a spectroscopic roadmap for understanding and engineering nickelate superconductors.

In parallel, I use THz FEL sources for Higgs spectroscopy — directly coupling to superconducting amplitude modes — combined with RIXS to study collective excitations and pairing symmetry in unconventional superconductors. These complementary probes access both the charge and spin channels, providing a comprehensive picture of the electronic interactions that give rise to superconductivity.