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

Phys. Rev. Lett. 92, 137402 – Published 2 April 2004
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, and T. Gog

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, the onset of which exhibits a small dispersion of 0.4eV. Within this continuum, a highly dispersive feature with a large sinusoidal dispersion (1.1eV) 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.

DOI: http://dx.doi.org/10.1103/PhysRevLett.92.137402

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  • Received 21 July 2003
  • Published 2 April 2004

© 2004 The American Physical Society

Authors & Affiliations

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

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