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Bound Excitons inSr2CuO3
2008
Physical Review Letters
We investigated temperature dependent optical spectra of the one-dimensional chain compound Sr_2CuO_3. 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 blue shift and reveals additional sharp peaks at the gap. Even though many spectroscopic studies suggest that this material can not have a bound exciton based on the
doi:10.1103/physrevlett.101.177404
pmid:18999786
fatcat:3ln2dcipfjeirpyp7axmm2q3j4