Absence of compressible edge channel rings in quantum antidots - art. no. 146801

We report resonant tunneling experiments in a quantum antidot sample in the integer quantum Hall regime. In particular, we have measured the temperatu re T dependence of the peak value of a conductance peak on the i = 2 platea u, where there are two peaks per magnetic flux quantum phi (0). We observe a T-1 dependence as expected when tunneling through only one electron state is possible. This result is incompatible with tunneling through a compress ible ring of several degenerate states. We also observe, for the first time , three conductance peaks per phi (0) on the i = 3 plateau.