Caractérisation de puits quantiques GaInAs / InP par spectrométrie magnéto-optique

Abstract : Low temperature absorption spectroscopy under magnetic field (0-8 tesla) in faraday configuration is used to determine the actual profile of InGaAs/InP multi-quantum wells structures. A method is developped for a quantitative analysis of the spectra as a function of the field magnitude. The enveloppe function approach is used and the band non-parabolicity is taken into account though the k.p theory. The coulomb interaction of the electron-hole pair under magnetic field (magneto-exciton) is solved without any requirement on the order of magnitude of the field. The carrier motion along the quantification direction is also included. An applied magnetic field both increases the energy distance between exciton states and the oscillator strengths. These effects, together with the existence of several allowed transitions confinement levels, give significantly rich spectra, provided a fair periodicity of the structure and a good in-plane homogeneity of the interfaces are achieved. Every sample spectra are analysed by performing a systematic calculation of magneto-exciton transition energies. The well width and alloy composition are taken as fitting parameters. For narrow wells, graded interfaces layers effects are also taken into account. In some cases, agreement with experimental finding requires structure parameters somewhat different from nominal data. Defects of periodicity in the structures are quantitatively investigated
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Nathalie Marreaud. Caractérisation de puits quantiques GaInAs / InP par spectrométrie magnéto-optique. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1997. Français. ⟨NNT : 1997METZ055S⟩. ⟨tel-01777233⟩

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