Evidence of phonon-mediated coupling between charge transfer and ligand field excitons in Sr2CuO2Cl2

Article

关键词: TEMPERATURE-DEPENDENCE;    ELECTRONIC-STRUCTURE;    EXCITATIONS;    ABSORPTION;    SPECTRA;   

DOI  :  10.1103/PhysRevB.63.235104

来源: SCIE

【 摘 要 】

We present a comparative experimental and theoretical investigation of the two-dimensional charge transfer gap in the strongly correlated material Sr2CuO2Cl2. We observe an Urbach behavior in the absorption profile over a surprisingly wide range of energies and temperatures. We present a model that accounts for phonon scattering to infinite order and that allows us to explain the data accurately by assuming coupling of the charge transfer gap exciton to lower-energy electronic excitations.

【 授权许可】

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