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Phys. Rev. Lett. 92, 137402 (2004) [4 pages]

Resonant Inelastic X-Ray Scattering of the Holon-Antiholon Continuum in SrCuO2

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Young-June Kim1, J. P. Hill1, H. Benthien2, F. H. L. Essler1, E. Jeckelmann3, H. S. Choi4, T. W. Noh4, N. Motoyama5, K. M. Kojima5, S. Uchida5, D. Casa6, and T. Gog6
1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
2Department of Physics, Philipps University Marburg, D-35032, Marburg, Germany
3Institute of Physics, University of Mainz, D-55099 Mainz, Germany
4ReCOE and School of Physics, Seoul National University, Seoul 151-747, Korea
5Graduate School of Frontier Sciences, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
6CMC-CAT, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 21 July 2003; published 2 April 2004

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 ∼0.4  eV. Within this continuum, a highly dispersive feature with a large sinusoidal dispersion (∼1.1  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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.137402
DOI:
10.1103/PhysRevLett.92.137402
PACS:
78.70.Ck, 71.10.Fd, 75.10.Pq, 78.30.–j
 
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