Momentum-Dependent Charge Transfer Excitations in Sr2CuO2Cl2 - Angle Resolved Electron Energy Loss Spectroscopy

Y. Y. Wang; F. C. Zhang; V. P. Dravid; K. K. Ng; M. V. Klein; S. E. Schnatterly; L. L. Miller

doi:10.1103/PhysRevLett.77.1809

Momentum-Dependent Charge Transfer Excitations in Sr2CuO2Cl2 - Angle Resolved Electron Energy Loss Spectroscopy

Condensed Matter 2009-10-28 v1

Authors: Y. Y. Wang , F. C. Zhang , V. P. Dravid , K. K. Ng , M. V. Klein , S. E. Schnatterly , L. L. Miller

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Abstract

Electron-hole pair excitations in the insulating cuprates $Sr_2CuO_2Cl_2$ were investigated by angle-resolved electron energy loss spectroscopy. The optically allowed and optically forbidden transitions were observed to be strongly anisotropic in $Cu-O_2$ plane. The former show a large energy dispersion $\sim 1.5$ eV along [110], and the latter appear at a higher energy position ( $\sim 4.5$ eV) only along [100], but not along [110]. We interpret these results as transitions involving excitons. A small exciton model is examined to explain both the observed features.

Keywords

charge transfer excitations Sr2CuO2Cl2 angle-resolved electron energy loss spectroscopy exciton anisotropy cuprates

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@article{arxiv.cond-mat/9606064,
  title  = {Momentum-Dependent Charge Transfer Excitations in Sr2CuO2Cl2 - Angle Resolved Electron Energy Loss Spectroscopy},
  author = {Y. Y. Wang and F. C. Zhang and V. P. Dravid and K. K. Ng and M. V. Klein and S. E. Schnatterly and L. L. Miller},
  journal= {arXiv preprint arXiv:cond-mat/9606064},
  year   = {2009}
}

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11 pages, RevTex, 3 Postscript figures

Momentum-Dependent Charge Transfer Excitations in Sr2CuO2Cl2 - Angle Resolved Electron Energy Loss Spectroscopy

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