Universal waterfalls-like feature in the spectral function of high temperature superconductors
J. Graf, G. -H. Gweon, A. Lanzara
Abstract
By performing high resolution angle resolved photoemission spectroscopy (ARPES) experiments on four different families of p-type cuprates, over an energy range much bigger than investigated before, we report the discovery of a universal high energy anomaly in the spectral function. This anomaly is characterized by the presence of two new high energy scales E1= 0.35-0.45eV and E2=0.8-0.9eV and the pinning of the main ARPES spectral function along the boundary of a diamond in the momentum space. This anomaly unveils a missing link between the doped oxygen holes and the quasiparticles, providing a full range of relevant interaction to the high Tc problem.
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