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We have investigated the electronic structure of the zigzag ladder (chain)compound SrCuO2 combining polarized optical absorption, reflection,photoreflectance and pseudo-dielectric function measurements with the modelcalculations. These measurements yield an energy gap of 1.42 eV (1.77 eV) at300 K along (perpendicular) to the Cu-O chains. We have found that the lowestenergy gap, the correlation gap, is temperature independent. The electronicstructure of this oxide is calculated using both thelocal-spin-density-approximation with gradient correction method, and thetight-binding theory for the correlated electrons. The calculated density ofelectronic states for non-correlated and correlated electrons showsquasi-one-dimensional character. The correlation gap values of 1.42 eV(indirect transition) and 1.88 eV (direct transition) have been calculated withthe electron hopping parameters t = 0.30 eV (along a chain), t_yz = 0.12 eV(between chains) and the Anderson-Hubbard repulsion on copper sites U= 2.0 eV.We concluded that SrCuO_2 belongs to the correlated-gap insulators.Comment: 24 pages, 8 figures, to be published in Phys.Rev.

physical review. b, condensed matter

Optical studies of gap, hopping energies, and the Anderson-Hubbard parameter in the zigzag-chain compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SrCuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Optical studies of gap, hopping energies, and the Anderson-Hubbard parameter in the zigzag-chain compoundSrCuO2