MODEL STUDY OF INHOMOGENEOUS LINE BROADENING IN EXCITONIC SPECTRA OF QUANTUM-WELLS

An approach is proposed to estimate separately parameters of homogeneo us and inhomogeneous broadenings from an optical reflection line of a quasi-2D exciton. A phenomenological model is proposed to take into ac count statistically an inhomogeneous broadening of the exciton resonan t spectra. The concept is applied to study a modulation-doped heterost ructures with a single quantum well CdTe/CdMgTe. From exciton reflecti on lines taken in a magnetic field the temperature-dependent homogeneo us and inhomogeneous broadening parameters as well as the exciton radi ative decay rate are measured. PACS numbers: 78.20.Ci, 78.66.-w.