Inelastic X-ray scattering studies of electronic excitations

Ishii, Kenji; Toyama, Takami*; Mizuki, Junichiro

Inelastic X-ray Scattering (IXS) has developed as one of the most powerful momentum-resolved spectroscopies. Especially in the last decade, it achieved significant progress by utilizing brilliant X-rays from third generation synchrotron radiation facilities. Simultaneously, theoretical efforts have been made to predict or interpret the experimental spectra. One of the scientific fields studied intensively by means of IXS is strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties. IXS can provide a new insight into electron dynamics of the systems through the observation of charge, spin, and orbital excitations. Focusing on the momentum-resolved electronic excitations in strongly correlated electron systems, we review IXS studies and present capabilities of IXS for the study of dynamics of materials.