Two Types of Indirect-Exciton Ground States in Trigonal Selenium
- 22 January 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 42 (4), 264-267
- https://doi.org/10.1103/physrevlett.42.264
Abstract
Sharp luminescence lines from indirect-free-exciton decay are observed in selenium. These permit for the first time an unambiguous identification of the indirect gap. A unique feature of the band structure and symmetry is the existence of two almost degenerate types of excitons with different wave vectors, leading to a superposition of two different indirect-exciton luminescence spectra.Keywords
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