Effect of Coulomb enhancement on optical gain in (Zn,Cd)Se/ZnSe multiple quantum wells
- 15 December 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 54 (23) , 16417-16420
- https://doi.org/10.1103/physrevb.54.16417
Abstract
The optical-gain spectra of a 40-Å (Zn,Cd)Se/ZnSe multiple quantum well has been measured at various temperatures using a variable-stripe method. By comparison with a gain calculation including many-body effects, we have shown that gain in this structure arises from an electron-hole plasma (EHP) for temperatures higher than 140 K. Excellent agreement between experiment and theory allows us to demonstrate the significance of many-body effects such as carrier dephasing and Coulomb enhancement. The breakdown of the EHP model below 140 K indicates an increasing excitonic contribution. © 1996 The American Physical Society.Keywords
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