Microwave photoconductivity in widely tunable antidot arrays

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Abstract
Microwave photoconductivity is shown to be a powerful method to detect low-energy excitation of the electronic density in antidot arrays. From the experiments on size-tunable field-effect confined antidots, we can deduce the electronic density and the frequency dependence of the low-energy excitation (magnetoplasma modes around the antidots) as a function of the gate voltage. The observed dependence of the magnetoplasmon frequencies on the depletion radius can be analyzed by using the depletion radius obtained from magnetotransport experiments on the same structures.