The high-energy anomaly in ARPES spectra of the cuprates-many body or matrix element effect?

Abstract

We used polarization-dependent angle-resolved photoemission spectroscopy (ARPES) to study the high-energy anomaly (HEA) in the dispersion of Nd2-xCexCuO4, (x=0.123). We have found that at particular photon energies the anomalous, waterfalllike dispersion gives way to a broad, continuous band. This suggests that the HEA is a matrix element effect: it arises due to a suppression of the intensity of the broadened quasi-particle band in a narrow momentum range. We confirm this interpretation experimentally, by showing that the HEA appears when the matrix element is suppressed deliberately by changing the light polarization. Calculations of the matrix element using atomic wave functions and simulation of the ARPES intensity with one-step model calculations provide further proof for this scenario. The possibility to detect the full quasi-particle dispersion further allows us to extract the high-energy self-energy function near the center and at the edge of the Brillouin zone.

5 pages 2 figures, corrected typos

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• Influence of magnetic ordering on the spectral properties of binary transition metal oxides
• Evidence for Multiple Underlying Fermi Surface and Isotropic Energy Gap in the Cuprate Parent Compound Ca${}_2$CuO${}_2$Cl${}_2$
• Resolving unoccupied electronic states with laser ARPES in bismuth-based cuprate superconductors
• On the cuprates' universal waterfall feature: evidence of a momentum-driven crossover
• Lifetime of quasi-particles in the nearly-free electron metal Sodium
• Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands
• Anomalous band renormalization due to high energy $kink$ in the colossal thermoelectric material K${}_{0.65}$RhO${}_2$