Intradonor absorption spectra under external fields in quantum wells

This is the authors' abstract. We don't add key points for this paper.

The effects of magnetic and electric fields on the infrared-absorption properties associated to transitions between the 1s-like and 2p_±-, 3p_±-, and 4p_±-like excited states of hydrogenic donors in GaAs-Ga_1-x{Al}ₓ$As quantum wells are studied. The magnetic and electric fields are applied along the growth direction of the heterostructure, and donor envelope wave functions and energies are obtained within a variational procedure in the effective-mass approximation. Calculations for the intradonor transition strengths for x-polarized radiation and absorption coefficients are performed for finite-barrier potentials and as functions of applied magnetic and electric fields and quantum-well thicknesses. A discussion of a sum rule associated to donor transitions in quantum wells is presented. Theoretical results for the absorption spectra are in good agreement with available infrared-magnetospectroscopy measurements on doped quantums wells. {} 1996 The American Physical Society.