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We present a comparative experimental and theoretical investigation of thetwo--dimensional charge-transfer gap in the strongly correlated materialSr$_2$CuO$_2$Cl$_2$. We observe an Urbach behaviour in the absorption profileover a surprisingly wide range of energies and temperatures. We present a modelthat accounts for phonon scattering to infinite order and which allows us toexplain the data accurately by assuming coupling of the charge transfer gapexciton to lower energy electronic excitations.Comment: 20 pages, 6 figures, submitted to Phys. Rev.

physical review. b, condensed matter

Evidence of phonon-mediated coupling between charge transfer and ligand field excitons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="…

Evidence of phonon-mediated coupling between charge transfer and ligand field excitons inSr2CuO2