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

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

2003-07-21

arxiv.org/abs/cond-mat/0307497v2

Phys. Rev. Lett. 92, 137402 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Final version to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.137402

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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