Magneto-optical absorption spectrum of D- Ion in GaAs-Ga0.75Al0.25As quantum well

✍ Scribed by A. Natori; M. Fujito

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 215 KB
• Volume: 16
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1994.1126

✦ Synopsis

The magneto-optical absorption spectrum of a (D^{-})ion in a (\mathrm{GaAs}{-} \mathrm{Ga}{0.75} \mathrm{Al}_{0.25} \mathrm{As}) quantum well is calculated. We used the variational method based on a two orbital picture of a (D^{-})ion, in which each single electron orbital is represented by a linear combination of anisotropic Gaussian orbitals. The calculated magnetic ficld dependence of the binding energy of a (D^{-})ion agrees semi-quantitatively with the experimental result. In a magnetic field perpendicular to the well interface, the energies of the one-electron excited states of a (D^{-})ion are completely quantized, and broadening is essential for the calculation of the line shape of the magnetooptical ahsorption spectrum. We considered two types of broadening effect, lifetime broadening and inhomogeneous broadening. Only the lifetime broadening effect reproduces fairly well the observed line shape of the magneto photo-conductivity spectrum. The assumed value of the lifetime is consistent with the measured Hall mobility. The effects of correlation on the one electron excited states of a (\mathrm{D}^{-})ion are also discussed.