Abstract
Low-temperature magnetophotoluminescence studies of negatively charged excitons trions) are reported for n-type modulation-doped ZnSe/Zn(Cd,Mn)Se quantum wells over a wide range of Fermi energy and spin splitting. The magnetic composition is chosen such that these magnetic two-dimensional electron gases are highly spin polarized even at low magnetic fields, throughout the entire range of electron densities studied to ). This spin polarization has a pronounced effect on the formation and energy of with the striking result that the trion ionization energy (the energy separating from the neutral exciton) follows the temperature- and magnetic field–tunable Fermi energy. The large Zeeman energy destabilizes at the quantum limit, beyond which a separate photoluminescence peak appears and persists to 60 T, suggesting the formation of spin-triplet charged excitons.
- Received 7 January 2000
DOI:https://doi.org/10.1103/PhysRevB.61.R16307
©2000 American Physical Society