Abstract
Strong spin-flip-related Raman scattering (SFRS) from p-type Be-doped GaAs/As multiple quantum wells (MQW’s), as well as from an undoped sample, has been observed. In both cases the SFRS exhibits a strong dependence on the geometry of the experiment. A theory is developed that explains SFRS in p-type MQW’s as related to a spin flip of a hole bound to an acceptor via exchange interaction with a neighboring exciton. SFRS in the undoped MQW’s is explained as a flip of the angular momentum of an exciton localized by interface roughness via interaction with acoustic phonons (doubly resonant scattering by acoustic phonons). The g tensor of the hole bound to the acceptor is determined to be =+2.3, ≃0, and that of the localized exciton (-=+1.5, (-≃0 for the narrowest wells measured (∼40 Å).
- Received 8 July 1991
DOI:https://doi.org/10.1103/PhysRevB.45.4320
©1992 American Physical Society