Momentum resolved resonant inelastic X-ray scattering as a novel tool to study electronic structure of complex insulators

Well-developed momentum-resolved spectroscopies such as photoemission or neutron scattering cannot probe the full charge gap in insulators, We demonstrate that charge excitations across the full gap in a Mott insulator can be studied using high resolution inelastic X-ray scattering in a momentum-resolved manner which can provide momentum-resolved information about the unoccupied electronic band. We also briefly mention some advantages this technique has over other spectroscopies to study electronic structure of matter. (C) 2001 Published by Elsevier Science B.V.