Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-Tc superconductors

Details Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-Tc superconductors Effect of strong correlations on the high energy anomaly in hole- and electron-doped high-Tc superconductors

2008-07-21

arxiv.org/abs/0807.3359v2

New Journal of Physics 11, 093020 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Original: 4 pages, 4 figures; Replaced: changed and updated content, 12 pages, 6 figures

Scientific paper

10.1088/1367-2630/11/9/093020

Recently, angle-resolved photoemission spectroscopy (ARPES) 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). This paper demonstrates, using a combination of new ARPES measurements and quantum Monte Carlo simulations, that the HEA is not simply the by-product of matrix element effects, but rather represents a 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, in both hole- and electron-doped cuprates. While photoemission matrix elements clearly play a role in changing the aesthetic appearance of the band dispersion, i.e. the 'waterfall'-like behavior, 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 both hole and electron doping in a correlated material and provides a unifying description of the HEA across both sides of the cuprate phase diagram.

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