Doping Evolution of Oxygen K-edge X-ray Absorption Spectra in Cuprate Superconductors

ORAL

Abstract

We study oxygen K-edge x-ray absorption spectroscopy (XAS) and investigate the validity of the Zhang-Rice Singlet (ZRS) picture in overdosed cuprate superconductors. Using large-scale exact diagonalization of the three-orbital Hubbard model, we observe the effect of strong correlations manifesting in a dynamical spectral weight transfer from the upper Hubbard band to the ZRS band. The quantitative agreement between theory and experiment highlights an additional spectral weight reshuffling due to core-hole interaction. Our results confirm the important correlated nature of the cuprates and elucidate the changing orbital character of the low-energy quasi-particles, but also demonstrate the continued relevance of the ZRS even in the overdosed region.

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Authors

  • Cheng-Chien Chen Chen

    Advanced Photon Source, Argonne National Laboratory, Argonne National Lab

  • Michael Sentef

    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Science (SIMES), SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Yvonne Kung

    SIMES, SLAC and Stanford University, Department of Physics, Stanford University

  • Chunjing Jia

    Department of Applied Physics, Stanford, CA 94305, Department of Applied Physics, Stanford University, Stanford Institute for Materials and ENergy Sciences

  • Ronny Thomale

    Institute of Theoretical Physics, EPFL, Stanford University, EPFL Lausanne

  • Brian Moritz

    Stanford Institute of Materials and Energy Sciences, SLAC NATIONAL ACCELERATOR LABORATORY 2575 Sand Hill Road, Menlo Park, CA 94025, Northern Illinois University and the University of North Dakota, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

  • Arno Kampf

    Center for Electronic Correlations and Magnetism, University of Augsburg

  • Thomas Devereaux

    SLAC National Acceleratory Laboratory, Stanford University, Stanford CA 94305, USA, Stanford Institute of Materials and Energy Sciences, SLAC NATIONAL ACCELERATOR LABORATORY 2575 Sand Hill Road, Menlo Park, CA 94025, Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, SLAC National Accelerator Lab and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory