Abstract
The magneto-optical absorption spectrum of a ion in a GaAs-As quantum well is calculated. We used the variational method based on a two-orbital picture of a ion, in which each wave function is represented by a linear combination of anisotropic Gaussian orbitals. The calculated magnetic-field dependence of the binding energy of a ion agrees qualitatively with the experimental result. In a magnetic field perpendicular to the well interface, the energies of the one-electron excited states of a ion are completely quantized, and broadening is essential for the calculation of the line shape of the magneto-optical absorption 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-photoconductivity spectrum. The assumed value of the lifetime is consistent with the measured Hall mobility.
- Received 5 October 1994
DOI:https://doi.org/10.1103/PhysRevB.51.4637
©1995 American Physical Society