Bound Excitons in Sr₂CuO₃

Kim, Kyung Wan; Gu, G. D.; Homes, C. C.; Noh, T. W.

doi:10.1103/PhysRevLett.101.177404

Back

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

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 et de médecine

Department

Département de Physique

Language