Insights on the cuprate high energy anomaly observed in ARPES - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: Recently, angle-resolved photoemission spectroscopy has been used tohighlight an anomalously large band renormalization at high binding energies incuprate superconductors: the high energy -waterfall- or high energy anomalyHEA. The anomaly is present for both hole- and electron-doped cuprates aswell as the half-filled parent insulators with different energy scales arisingon either side of the phase diagram. While photoemission matrix elementsclearly play a role in changing the aesthetic appearance of the banddispersion, i.e. creating a -waterfall-like appearance, they provide aninadequate description for the physics that underlies the strong bandrenormalization giving rise to the HEA. Model calculations of the single-bandHubbard Hamiltonian showcase the role played by correlations in the formationof the HEA and uncover significant differences in the HEA energy scale forhole- and electron-doped cuprates. In addition, this approach properly capturesthe transfer of spectral weight accompanying doping in a correlated materialand provides a unifying description of the HEA across both sides of the cupratephase diagram. We find that the anomaly demarcates a transition, or cross-over,from a quasiparticle band at low binding energies near the Fermi level tovalence bands at higher binding energy, assumed to be of strong oxygencharacter.



Autor: B. Moritz, S. Johnston, T. P. Devereaux

Fuente: https://arxiv.org/







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