Resonant Inelastic X-ray Scattering to Find Weyl Mott Insulator Phase in Pyrochlore Iridate

We propose a resonant inelastic X-ray scattering (RIXS) experiment to investigate the theoretical prediction of a new topological phase, the Weyl Mott insulator, in the pyrochlore iridate system. Previous transport and spectroscopic studies have suggested the existence of a Weyl semimetal phase in pyrochlore iridates. However, our high-field Raman spectroscopy has revealed an unexpected low-energy excitation mode, whose energy scales linearly with the applied magnetic field. We propose that this near-zero energy excitation mode serves as a signature of the Weyl Mott insulator. To further examine this phenomenon, we propose a RIXS experiment to probe the dispersion and symmetry of this excitation mode. This proposal may providing crucial insights into the existence of Weyl Mott insulator phase, as well as expand the study of topological phases into strong correlated materials.