Abstract
We have performed an experimental investigation of equilibration between edge states in the fractional quantum Hall regime. We have developed a technique to alter the electrostatic potential at the edge continuously and controllably from a smooth to a sharp potential gradient, using a set of gates. A non-equilibrium current distribution in the edge states is created which then travels along the edge to a detector. The scattering between the various fractional edge states is investigated, and a method developed to calculate scattering probabilities between pairs of edge states, revealing independent 1 5 , 1 3 and 2 5 edge states, for a bulk filling factor of 2/3. Equilibration is found to depend strongly on the potential slope.
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