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Collective Response in the Microwave Photoconductivity of Hall Bar Structures

URN to cite this document:
Vasiliadou, E. ; Müller, G. ; Heitmann, D. ; Weiss, Dieter ; Klitzing, Klaus von ; Nickel, H. ; Schlapp, W. ; Lösch, R.
Date of publication of this fulltext: 05 Aug 2009 13:57


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.

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