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Resonant Inelastic x-ray scattering

Johnston et al., Nature Communications

RIXS is a photon-in, photon-out energy loss spectroscopy based on the resonant absorption and re-emission of photons. During the RIXS process, incident photons excite a core electron into the valence band, creating an intermediate excited state with a hole in a core level. The resulting core-hole potential creates many excitations in the system before the core hole decays, emitting a photon and leaving the system in an excited final state. The generated excitations encode information about the elementary excitations of the solid. RIXS is rapidly advancing as a powerful probe capable of accessing charge, orbital, spin, and lattice excitations in a momentum-resolved way. These capabilities make RIXS an ideal probe for systems with interacting and competing degrees of freedom.

Electron-lattice Interactions in RIXS

We have recently used RIXS to study spin, charge, and excitations in several quasi-1D edge-shared cuprates including Ca2+xY2-xCu5O10 (CYCO) [2] and Li2CuO2 (LCO) [3,4]. For example, the figure below shows results from one of our current collaborations studying lattice vibrations in the spin-chain system LCO, where we inferred a large renormalization of the charge transfer energy due to strong electron-phonon interactions in this material. These calculations utilized state-of-the-art exact diagonalization methods.

References and suggested papers

  1. L. L. J. P. Ament et al.. Rev. Mod. Phys. 83, 705–767 (2011).
  2. W. S. Lee et al., Phys. Rev. Lett. 110, 265502 (2013).
  3. C. Monney et al., Phys. Rev. Lett. 110, 087403 (2013).
  4. S. Johnston et al., Nature Communications 7, 10653 (2016).
  5. C. Monney et al., Phys. Rev. B 94, 165118 (2016).

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