Abstract
We report the observation of Coulomb interaction effects on the photoluminescence (PL) spectra of two-dimensional electron systems close to the quantum Hall state. Systematic measurements of the polarized PL spectrum as a function of the separation between the two-dimensional electron gas (2DEG) and the photoexcited valence-band hole allow us to identify the recombination mechanisms. These studies demonstrate the formation of bound states between the photoexcited valence-band hole and the 2DEG. Usually the exciton comprises a single electron in the upper spin level bound to the hole, but the PL line shape suggests that for large separations a Skyrmion-hole excitation forms the ground state.
- Received 29 May 1998
DOI:https://doi.org/10.1103/PhysRevB.58.R4227
©1998 American Physical Society