Abstract
We have studied the breakdown of the quantum Hall effect in a constriction defined by two trench fingers and an antidot, patterned on a Corbino ring. At filling factors near ν=2, the I– V characteristics show well developed current steps, which we interpret as a Coulomb staircase phenomenon due to charging of compressible strips around the antidot. The evolution of the current steps with filling factor is explained in terms of quasi-elastic inter Landau level scattering.
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