Optical excitations in Sr$_{2}$CuO$_{3}$

Details Optical excitations in Sr$_{2}$CuO$_{3}$ Optical excitations in Sr$_{2}$CuO$_{3}$

2008-08-09

arxiv.org/abs/0808.1381v2

Phys. Rev. B 79, 085121 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.79.085121

We investigated excitation spectra of the one-dimensional chain compound Sr$_{2}$CuO$_{3}$. The small peak at 2.3 eV in the loss function was turned to correspond to the strong charge transfer transition at 1.8 eV in conductivity. It has the excitonic character expected in one dimensional extended Hubbard model of the transition from the lower Hubberd band to the Zhang-Rice singlet state. The strongest peak at 2.7 eV in the loss function is attributed to the continuum excitation of the excitonic charge transfer transition. The spectral weight sum rule is satisfied within these transitions.

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