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We report phase sensitive measurements of microwave propagation through ahigh mobility two dimensional electron gas subjected to a perpendicularmagnetic field. Two types of configurations were used, one that allows all wavevectors q, and one that selects only specific q values. The spectrum of edgeexcitations was studied over a broad frequency span, which allowed us toobserve the logarithmic dispersion of edge magneto-plasmons.Comment: 12 pages, Postscript only, 4 Postscript figure

Observation of the logarithmic dispersion of high-frequency edge excitations