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We have investigated the microwave  photoconductivity of 100-ìm- and 50-ìm-wide  Hall bars fabricated from GaAs/AlxGa1-xAs  heterostructures. We found resonant  responses at frequencies fres with fres2(B) =fres2(B=0)+fc2, where fc is the cyclotron  frequency of the two-dimensional electron  gas in the perpendicularly applied magnetic  field B. This shows that the photoresponse  is dominated by collective plasmon  excitations confined within the width of the  Hall structure

Collective response in the microwave photoconductivity of Hall bar structures