Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-06-12
Phys. Rev. Lett. 101, 177404 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
4 figures
Scientific paper
10.1103/PhysRevLett.101.177404
We investigated temperature dependent optical spectra of the one-dimensional chain compound Sr$_{2}$CuO$_{3}$. 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 one-dimensional extended Hubbard model, we attribute the additional sharp peaks to excitons, which come to exist due to the long range Coulomb interaction.
Gu G.-D.
Homes Christopher C.
Kim Ki Wook
Noh Tae Won
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