TRANSITIONS BETWEEN EDGE AND BULK CHANNELS IN THE QUANTUM HALL REGIME

An extended network model of the transition regime between two integer quantum Hall plateaus is presented. When it is used to analyze experi mental data, two parameters of interest are extracted: the resistivity of the bulk conducting channel due to the energetically topmost Landa u level and the scattering length between the bulk channel and the edg e channels. The behavior of the equilibration length is studied for tr ansitions between the two spin states of a given Landau level and betw een Landau levels with different quantum numbers. In some non-ideal de vices, the nonlocal aspects of the transition regime cause dramatic an d non-intuitive device behavior.