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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Published on: October 9, 2012

Bound excitons in Sr2CuO3.

K W Kim1, G D Gu, C C Homes

  • 1Department of Physics, University of Fribourg, Chemin du Muse 3, Fribourg, Switzerland. kyungwan.kim@gmail.com

Physical Review Letters
|November 13, 2008
PubMed
Summary
This summary is machine-generated.

Optical spectra of Sr2CuO3 reveal temperature-dependent charge transfer transitions. Sharp peaks at low temperatures suggest the presence of excitons due to long-range Coulomb interactions in this 1D compound.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Sr2CuO3 is a one-dimensional chain compound.
  • Optical spectra are crucial for understanding electronic properties.
  • The one-dimensional extended Hubbard model is a theoretical framework for such materials.

Purpose of the Study:

  • Investigate temperature-dependent optical spectra of Sr2CuO3.
  • Analyze the charge transfer transition and its line shape.
  • Determine the origin of sharp peaks observed at low temperatures.

Main Methods:

  • Temperature-dependent optical spectroscopy.
  • Analysis of polarized charge transfer transitions.
  • Comparison with theoretical models like the one-dimensional extended Hubbard model.

Main Results:

  • The charge transfer transition polarized along the chain direction exhibits a strongly asymmetric line shape.
  • At low temperatures, a significant blueshift of the charge transfer peak is observed.
  • Additional sharp peaks appear at the gap at low temperatures.

Conclusions:

  • The observed spectral features are consistent with the one-dimensional extended Hubbard model.
  • Despite theoretical suggestions against bound excitons, the sharp peaks are attributed to excitons.
  • Long-range Coulomb interaction is identified as the mechanism enabling exciton formation in Sr2CuO3.