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Kataoka, M; Johnson, N; Emary, C; See, P; Griffiths, J P; Jones, G A C; Farrer, I; Ritchie, D A; Pepper, M; Janssen, T J B M
Physical review letters, 2016-Mar-25, Letnik: 116, Številka: 12Journal Article
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 v is deduced. We find that v follows 1/B dependence, in good agreement with the Eover →×Bover → drift. The edge potential is estimated from the energy dependence of v using a harmonic approximation.
