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Resonant inelastic X-ray scattering of the holon-antiholon continuum in SrCuO2

Kim YJ, Hill JP, Benthien H, Essler FHL, Jeckelmann E, Choi HS, Noh TW, Motoyama N, Kojima KM, Uchida S, Casa D, Gog T

92 (13): Art. No. 137402 APR 2 2004
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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, the onset of which exhibits a small dispersion of similar to0.4 eV. Within this continuum, a highly dispersive feature with a large sinusoidal dispersion (similar to1.1 eV) is observed. 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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