REMOTE AND SPATIALLY SEPARATED D- CENTERS IN QUASI-2-DIMENSIONAL SEMICONDUCTOR STRUCTURES

The electronic structure, binding energy, and correlation functions of three different spatial configurations of D- centers in GaAs-based se miconductor structures are studied using a numerical technique that so lves the two-electron Schrodinger equation for such systems. We compar e our results for the quantum well D-w(-) with experimental data and v ariational and diffusion Monte Carlo calculations: We demonstrate the existence of the spatially separated D-s(-) center as a bound state, e ven in the regime of very low magnetic fields, and find interesting an ticrossings among the energy levels in its electronic structure, which underlie a spectrum composition df a D-0 donor center and a free elec tron in a magnetic field. For the remote D-r(-) center we find that st rong electron-electron correlations can give rise to magnetic-field-in duced angular-momentum transitions, and as the magnetic held increases , these correlations weaken, while eventually the system magnetically evaporates approaching the classical unbound regime.