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Excitonic recombination processes in spin-polarized two-dimensional electron gases

1998; American Physical Society; Volume: 58; Issue: 8 Linguagem: Inglês

10.1103/physrevb.58.r4227

1095-3795

J. L. Osborne, A. J. Shields, M. Y. Simmons, Nigel R. Cooper, D. A. Ritchie, M. Pepper,

Electronic and Structural Properties of Oxides

We report the observation of Coulomb interaction effects on the photoluminescence (PL) spectra of two-dimensional electron systems close to the $\ensuremath{\nu}=1$ 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 $\ensuremath{\nu}=1$ 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.