Seminarium Fizyki Materii Skondensowanej

Resonant inelastic X-ray scattering (RIXS) is one of techniques that has developed greatly with the study of cuprate high-temperature superconductors, which is similar to angle-resolved photoelectron spectroscopy. Charge excitation within the 3dx2-y2 orbital and two-magnon excitation appear in the low energy region of the RIXS spectrum via excitation of 2p electrons in Cu to the 3d orbital by incident photons. In addition to these spin-nonflip excitations, spin-flip excitations ((para) magnon excitations) due to the spin-orbit interaction of the 2p core level are observed in Cu L-edge RIXS. In this talk, I will introduce the current status of research in cuprates using RIXS as well as the theoretical investigations of our group. In particular, I discuss recent exact diagonalization and dynamical density-matrix renormalization group (DMRG) studies on the dependence of RIXS intensity on incident X-ray energy, the difference in behavior between hole-doped and electron-doped systems, and spin excitation in stripe order in connection with recent experimental data on RIXS for cuprates.