Insights on the cuprate high energy anomaly observed in ARPES

Details Insights on the cuprate high energy anomaly observed in ARPES Insights on the cuprate high energy anomaly observed in ARPES

2010-04-27

arxiv.org/abs/1004.4685v1

Journal of Electron Spectroscopy and Related Phenomena 181, 31 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures; Submitted to the Proceedings of CORPES09

Scientific paper

Recently, angle-resolved photoemission spectroscopy has been used to highlight an anomalously large band renormalization at high binding energies in cuprate superconductors: the high energy "waterfall" or high energy anomaly (HEA). The anomaly is present for both hole- and electron-doped cuprates as well as the half-filled parent insulators with different energy scales arising on either side of the phase diagram. While photoemission matrix elements clearly play a role in changing the aesthetic appearance of the band dispersion, i.e. creating a "waterfall"-like appearance, they provide an inadequate description for the physics that underlies the strong band renormalization giving rise to the HEA. Model calculations of the single-band Hubbard Hamiltonian showcase the role played by correlations in the formation of the HEA and uncover significant differences in the HEA energy scale for hole- and electron-doped cuprates. In addition, this approach properly captures the transfer of spectral weight accompanying doping in a correlated material and provides a unifying description of the HEA across both sides of the cuprate phase diagram. We find that the anomaly demarcates a transition, or cross-over, from a quasiparticle band at low binding energies near the Fermi level to valence bands at higher binding energy, assumed to be of strong oxygen character.

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