Abstract
The high frequency conductance G of a quantum point contact was studied for f ⩽ 300 MHz . While the real part R ( G ) remains unchanged by frequency we observe a stepwise change of the imaginary part I ( G ) when adding additional conductance channels. The step height Δ I ( G ) is linear in frequency with a positive slope and thus has capacitive character with a Δ C per channel of a few fF.
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