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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.doi:10.1103/physrevb.54.16417 pmid:9985758 fatcat:5fxaegyj6zhh3m4647rljsh3ey