Polaronic Excitons in ZnCdSe/ZnSe Quantum Wells

Abstract

We present a detailed investigation of excitonic absorption in $Z{n}_{0.69}C{d}_{0.31}Se/ZnSe$ quantum wells under the application of a perpendicular magnetic field. The large energy separation between heavy- and light-hole excitons allows us to clearly resolve and identify magneto-excitonic absorption resonant with the continuum edge of the 1S heavy-hole exciton. Experimental values of the exciton binding energy are compared with results of a theoretical model that includes the exciton-phonon interaction. The remarkable agreemeent found unambiguously indicates the predominant polaronic character of excitons in ZnSe-based heterostructures.

8 RevTex pages, 3 PostScript figures, submitted to Phys. Rev. B