Momentum-Dependent Charge Transfer Excitations inSr2CuO2Cl2Angle-Resolved Electron Energy Loss Spectroscopy

Autor:	Miles V. Klein, Ka Kin Ng, S. E. Schnatterly, Vinzyak Dravid, Lance L. Miller, Fu-Chun Zhang, Yun-Yu Wang
Rok vydání:	1996
Předmět:	Physics Momentum Electron energy loss spectroscopy Exciton General Physics and Astronomy Charge (physics) Cuprate Electronic structure Atomic physics Spectroscopy Anisotropy
Zdroj:	Physical Review Letters. 77:1809-1812
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.77.1809
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2a8dc7f0d33a522b0a33f508ca852963 https://doi.org/10.1103/physrevlett.77.1809 Zobrazit plný text záznamu