Abstract
The magnetic g factor for n=1 heavy-hole–electron excitons in type-I GaAs/As quantum wells has been determined at 1.8 K as a function of well width () from the Zeeman splitting of the luminescence line below 2 T. Combined with previously published g-factor measurements for electrons and heavy holes this gives a complete picture of the variation of the magnitudes and signs of the three g factors. The variation of electron g factor can be understood in terms of the nonparabolicity of the conduction band of GaAs using three-band k⋅p perturbation theory, but that of the hole and exciton g factors is not reproduced by existing theory, implying a well width dependence of the Luttinger parameters κ and q.
- Received 9 December 1991
DOI:https://doi.org/10.1103/PhysRevB.45.3922
©1992 American Physical Society