Revealing the Coulomb interaction strength in a cuprate superconductor

S. -L. Yang, J. A. Sobota, Y. He +10

We study optimally doped Bi${}_2$Sr${}_2$Ca${}_{0.92}$Y${}_{0.08}$Cu${}_2$O${}_{8+\delta }$ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are res…