MAGNETIC-FIELD DEPENDENCE OF THE HIGH-FREQUENCY CAPACITIVE RESPONSE OF A 2-DIMENSIONAL ELECTRON-GAS IN THE QUANTUM HALL REGIME

The rf-transmission between two antennas coupling capacitively to a 2- dimensional electron gas at a GaAs-AlGaAs heterojunction is investigat ed as a function of magnetic field < 6 T and frequency < 600 MHz at a temperature T similar to 1.5 K. It is found that the coupling between the antennas terminates at the frequency of an edge magnetoplasma reso nance, both on and outside the Quantum Hall plateaus.