Internal Transitions of Two-Dimensional Charged Magneto-Excitons X-: Theory and Experiment

Internal spin-singlet and spin-triplet transitions of charged excitons X- in magnetic fields in quantum wells have been studied experimentally and theoretically. The allowed X- transitions are photoionizing and exhibit a characteristic double-peak structure, which reflects the rich structure of the magnetoexciton continua in higher Landau levels (LL's). We discuss a novel exact selection rule, a hidden manifestation of translational invariance, that governs transitions of charged mobile complexes in a magnetic field.Comment: 4 pages, 2 figures, submitted to Physica

Magnetoexcitons in zero-dimensional parabolic quantum dots

The effects of lateral confinement and strong magnetic fields on the energy levels and optical spectra of magnetoexcitons in a disk-like parabolic quantum dot are considered. For a QD which in the absence of a magnetic field B is in the strong confinement regime, a crossover to the weak confinement regime can be realized when B is increased. Energy spectra and dipole matrix elements of optical transitions in different confinement regimes are found