Time-of-Flight Measurements of Single-Electron Wave Packets in Quantum Hall Edge States
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...
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| Hlavní autori: | , , , , , , , , , |
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| Ďalší autori: | |
| Jazyk: | English |
| Vydavateľské údaje: |
American Physical Society
2019
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| On-line prístup: | https://demo7.dspace.org/handle/123456789/447 |
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| Shrnutí: | 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 E × B drift. The edge potential is estimated from the energy dependence of v using a harmonic approximation. |
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