Internal transitions of negatively charged magneto-excitons and many body effects in a two-dimensional electron gas

Details Internal transitions of negatively charged magneto-excitons and many body effects in a two-dimensional electron gas Internal transitions of negatively charged magneto-excitons and many body effects in a two-dimensional electron gas

2001-08-21

arxiv.org/abs/cond-mat/0108340v2

Physics

Condensed Matter

11 pages + 3 figures, final version accepted in PRL

Scientific paper

10.1103/PhysRevLett.88.056801

Spin-singlet and spin-triplet internal transitions of quasi-two-dimensional, negatively charged magneto-excitons (X-) and their evolution with excess electron density have been studied in GaAs/AlGaAs quantum-wells by optically detected resonance (ODR) spectroscopy. In the dilute electron limit, due to magnetic translational invariance, the ODR spectra are dominated by bound-to-continuum bands in contrast to the superficially similar negatively-charged-donor system D-, which exhibits strictly bound-to-bound transitions. With increasing excess electron density in the wells in the magnetic field region corresponding to Landau level filling factors nu < 2 the X- like transitions are blue-shifted; they are absent for nu > 2. The blue-shifted transitions are explained in terms of a new type of collective excitation -- magnetoplasmons bound to a mobile valence band hole, which demonstrates the many-body nature of "exciton-like" magnetoluminescence for nu < 2.

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