Theoretical study of resonant inelastic X-ray scattering in ladder cuprates

The Cu K-edge resonant inelastic X-ray scattering (RIXS) spectrum in ladder cuprates is theoretically examined by using the exact diagonalization technique on the Hubbard ladder model. We find that the spectrum has characteristic momentum dependences in both insulating and doping cases. The results give useful information for analyzing the data of the RIXS experiment.