Gapped collective charge excitations and interlayer hopping in cuprate superconductors

M. Hepting, M. Bejas, A. Nag +17

We use resonant inelastic x-ray scattering (RIXS) to probe the propagation of plasmons in the electron-doped cuprate superconductor Sr${}_{0.9}$La${}_{0.1}$CuO${}_2$ (SLCO). We detect a…