Optical anisotropy in GaSe
- 7 June 1975
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 8 (11), 1763-1768
- https://doi.org/10.1088/0022-3719/8/11/029
Abstract
Normal-incidence reflectivity spectra of layer-type beta -GaSe crystals have been measured for E perpendicular to c as well as E//c at 78K. A strong anisotropy in the selection rules for interband transitions has been observed and a suitable energy level scheme is proposed. The reflectivity spectra of the mixed polytype epsilon , gamma -GaSe have also been measured for E perpendicular to c at 78K and 300K. These show similar selection rules as in the beta form for the same polarization, indicating that the optical properties of GaSe are basically determined by the symmetry of a single layer, rather than by the symmetry resulting from the different layer stacking.Keywords
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