Absence of compressible edge channel rings in quantum antidots.
We report resonant tunneling experiments in a quantum antidot sample in the integer quantum Hall regime. In particular, we have measured the temperature T dependence of the peak value of a conductance peak on the i = 2 plateau, where there are two peaks per magnetic flux quantum straight 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 compressible ring of several degenerate states. We also observe, for the first time, three conductance peaks per straight phi(0) on the i = 3 plateau.
Karakurt
I
I
Department of Physics, State University of New York, Stony Brook, New York 11794-3800, USA.
Goldman
V J
VJ
Liu
J
J
Zaslavsky
A
A