Effect of Coulomb enhancement on optical gain in (Zn,Cd)Se/ZnSe multiple quantum wells

F. P. Logue, P. Rees, J. F. Heffernan, C. Jordan, J. F. Donegan, J. Hegarty, F. Hiei, A. Ishibashi
1996 Physical Review B (Condensed Matter)  
The optical-gain spectra of a 40-Å ͑Zn,Cd͒Se/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 ͑EHP͒ 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.
more » ... omb enhancement. The breakdown of the EHP model below 140 K indicates an increasing excitonic contribution.
doi:10.1103/physrevb.54.16417 pmid:9985758 fatcat:5fxaegyj6zhh3m4647rljsh3ey