Abstract
Double-layered antidot arrays have been prepared by deep mesa etching of modulation-doped Al x Ga 1− x As GaAs double-quantum-wells. In far infra-red transmission spectroscopy we observe a rich mode spectrum arising from collective optical (in phase) and acoustic (out of phase) oscillation in the two layers. In a magnetic field we find huge filling factor dependent oscillations of the frequency of the edge magnetoplasmon modes which are caused by self-consistent screening of the edge potential.
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