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  • Title: Unraveling the nature of charge excitations in La₂CuO₄ with momentum-resolved Cu K-edge resonant inelastic x-ray scattering.
    Author: Chen CC, Moritz B, Vernay F, Hancock JN, Johnston S, Jia CJ, Chabot-Couture G, Greven M, Elfimov I, Sawatzky GA, Devereaux TP.
    Journal: Phys Rev Lett; 2010 Oct 22; 105(17):177401. PubMed ID: 21231077.
    Abstract:
    The results of model calculations using exact diagonalization reveal the orbital character of states associated with different Raman loss peaks in Cu K-edge resonant inelastic x-ray scattering (RIXS) from La₂CuO₄. The model includes electronic orbitals necessary to highlight the nonlocal Zhang-Rice singlet, charge transfer, and d-d excitations, as well as states with apical oxygen 2p(z) character. The dispersion of these excitations is discussed with prospects for resonant final state wave-function mapping. A good agreement with experiments emphasizes the substantial multiorbital character of RIXS profiles in the energy transfer range 1-6 eV.
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