Abstract
The magnetoluminescence spectra of symmetric quantum wells containing an electron gas show an abrupt transition from Landau level behavior (i.e. a linear shift of energy with field) to quadratic (exciton-like) behavior at the field at which the lowest Landau level is just filled, so that the electron filling factor νe = 2. Professor Rashba's insight was that this transition is a natural (although surprising, since the high field limit is by no means reached) consequence of the hidden symmetry which is known to hold in two-dimensional systems at high fields. This interpretation also accounts for the appearance ofmagnetoplasmon, “shake-up” and cyclotron satellites when νe > 2.
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