VARIATIONAL STUDIES OF D(0) AND D- CENTERS IN MAGNETIC-FIELDS IN BULKCRYSTALS AND IN PARABOLIC QUANTUM-WELLS

A linear combination of a few Gaussian functions of variable widths an d anisotropy was used as a trial function for D0 centers in bulk cryst als and in parabolic quantum wells in the presence of a magnetic field . The same types of functions with an additional correlation factor we re then used for D- ions in the bulk and in parabolic quantum wells. A ll integrals including the electron-electron interaction were calculat ed analytically. The results obtained for the bulk are very accurate f or D0 centers and quite close to the experimental data for D- ions in GaAs. The impurities in parabolic quantum wells were not yet experimen tally investigated but the present results indicate that even in the c ase of a uniform spatial distribution they should lead to well-defined infrared absorption maxima.