Bound Excitons in Sr${}_2$CuO${}_3$

Abstract

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.

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References in corpus (5)

• Manifestation of spin-charge separation in the dynamic dielectric response of one--dimensional Sr2CuO3
• Optical excitations in a one-dimensional Mott insulator
• Spin and charge dynamics of the one-dimensional extended Hubbard model
• Doping of a One-Dimensional Mott Insulator: Photoemision and Optical Studies of Sr${}_2$CuO${}_{3+\delta }$
• Enhancement of phonon effects in photoexcited states of one-dimensional Mott insulators

Cited by in corpus (7)

• Electrodynamics of Correlated Electron Materials
• Quantum interference between charge excitation paths in a solid state Mott insulator
• Real-time dynamics of particle-hole excitations in Mott insulator-metal junctions
• Exciton doublet in the Mott-Hubbard LiCuVO${}_4$ insulator identified by spectral ellipsometry
• Wannier-Stark ladders and Stark shifts of excitons in Mott insulators
• Quantum control of Hubbard excitons
• Optical excitations in Sr${}_2$CuO${}_3$