We study the propagation of edge magnetoplasmons by time-resolved current measurements in a sample which allows for selective detection of edge states in the quantum Hall regime. At filling factors close to nu=3 we observe two decoupled modes of edge excitations, one of which is related to the innermost compressible strip and is identified as an interedge magnetoplasmon mode. From the analysis of the propagation velocities of each mode the internal spatial parameters of the edge structure are derived.

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We utilize the tunneling between edge states of the lowest Landau level to study the behavior of the spin splitting in a wide range of magnetic fields up to 28 T. We find that the Zeeman energy with the bare |g*|=0.44 of GaAs mainly accounts for the observed threshold in the bias voltage between edge states. There is no evidence for the exchange interaction considerably affecting the measured energy gaps at the edge of a two-dimensional electron system.

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