CLASSICAL EDGE MAGNETOPLASMON IN A GAAS ALGAAS 2-DIMENSIONAL ELECTRON-SYSTEM/

We have studied the edge magnetoplasmon (EMP) in a GaAs/AlGaAs two-dim ensional electron gas (2DEG) system under conditions where the quantum Hall effect (QHE) is not observed; we call this a classical EMP. The classical EMP's are excited in a 2DEG disk by radio frequency electric field excitation (less than or equal to 1 GHz) in a high magnetic fie ld B (less than or equal to 5 T) with the 2DEG sheet carrier density n (s) between 2 x 10(15) m(-2) and 1 x 10(16) m(-2). The resonant freque ncy is found to be almost proportional to n(s) and inversely proportio nal to B, which agrees quantitatively with the theory proposed by Volk ov and Mikhailov, Sov. Phys.-JETP 67 (1988) 1639 by assuming the effec tive die-lectric constant <(epsilon)over cap>=(1+epsilon(GaAs))/2 wher e epsilon(GaAs) is appropriate to the GaAs. A comparison of the experi mental results with the calculations revealed that the electron mobili ty plays an important role in the definition of the EMP frequency.