Journal article

Bound Excitons in Sr₂CuO₃

  • Kim, Kyung Wan Department of Physics, University of Fribourg, Switzerland - Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, USA - School of Physics and Research Center for Oxide Electronics, Seoul National University, Korea
  • Gu, G. D. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, USA
  • Homes, C. C. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York, USA
  • Noh, T. W. School of Physics and Research Center for Oxide Electronics, Seoul National University, Korea
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    17.10.2008
Published in:
  • Physical Review Letters. - 2008, vol. 101, no. 17, p. 177404
English We investigated temperature dependent optical spectra of the one-dimensional chain compound Sr₂CuO₃. The charge transfer transition polarized along the chain direction shows a strongly asymmetric line shape as expected in one-dimensional extended Hubbard model. At low temperature, the charge transfer peak shows a large blueshift and reveals additional sharp peaks at the gap. Even though many spectroscopic studies suggest that this material cannot have a bound exciton based on the one-dimensional extended Hubbard model, we attribute the additional sharp peaks to excitons, which come to exist due to the long-range Coulomb interaction.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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https://folia.unifr.ch/unifr/documents/300952
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