Abstract
We present a theoretical study of the intradonor infrared-absorption properties associated with transitions between the 1s-like ground state and 2-like excited states of hydrogenic donors in a GaAs-As quantum well under electric and magnetic fields, both applied along the growth direction of the heterostructure. Donor energies and envelope wave functions of 1s-like and 2-like states are obtained within a variational procedure in the effective-mass approximation, and the line strengths for intradonor 1s-2 transitions are obtained for x-polarized radiation and for donor positions along the quantum well. The 1s-2 absorption spectra are calculated and theoretical results compare rather well with experimental data by Jarosik et al. [Phys. Rev. Lett. 54, 1283 (1985)] and Yoo et al. [Phys. Rev. B 44, 13 152 (1991)]. Also, the present work unambiguously shows that a calculation of the absorption spectra with the appropriate doping profile is needed if one aims to a full understanding of experimental measurements.
- Received 4 January 1995
DOI:https://doi.org/10.1103/PhysRevB.51.13344
©1995 American Physical Society