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Resonant inelastic x-ray scattering study of holon-antiholon continuum in SrCuO2

Young-June Kim·J. P. Hill·H. Benthien·F. H. L. Essler·E. Jeckelmann·H. S. Choi·T. W. Noh·N. Motoyama·K. M. Kojima·S. Uchida·D. Casa·T. Gog
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Abstract

We report a resonant inelastic x-ray scattering study of charge excitations in the quasi-one-dimensional Mott insulator SrCuO2. We observe a continuum of low-energy excitations, in which a highly dispersive feature with a large sinusoidal dispersion (~1.1 eV) resides. We have also measured the optical conductivity, and studied the dynamic response of the extended Hubbard model with realistic parameters, using a dynamical density-matrix renormalization group method. In contrast to earlier work, we do not find a long-lived exciton, but rather these results suggest that the excitation spectrum comprises a holon-antiholon continuum together with a broad resonance.

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Young-June Kim, J. P. Hill, H. Benthien, F. H. L. Essler, E. Jeckelmann, H. S. Choi, T. W. Noh, N. Motoyama, K. M. Kojima, S. Uchida, D. Casa, T. Gog. 2004-01-23. Resonant inelastic x-ray scattering study of holon-antiholon continuum in SrCuO2. https://doi.org/10.1103/physrevlett.92.137402

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