Abstract
We report time-of-flight measurements on electrons traveling in quantum Hall edge states. Hot-electron wave packets are emitted one per cycle into edge states formed along a depleted sample boundary. The electron arrival time is detected by driving a detector barrier with a square wave that acts as a shutter. By adding an extra path using a deflection barrier, we measure a delay in the arrival time, from which the edge-state velocity is deduced. We find that follows dependence, in good agreement with the drift. The edge potential is estimated from the energy dependence of using a harmonic approximation.
- Received 9 December 2015
DOI:https://doi.org/10.1103/PhysRevLett.116.126803
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