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Electromagnetic Aharonov-Bohm effect in a two-dimensional electron gas ring
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Description
We define a mesoscopic ring in a two-dimensional electron gas interrupted by two tunnel barriers, enabling us to apply a well-defined potential difference between the two halves of the ring. The electron interference in the ring is modified using a perpendicular magnetic field and a bias voltage. We observe clear Aharonov-Bohm oscillations up to the quantum Hall regime as a function of both parameters. The electron travel time between the barriers is found to increase with the applied magnetic field. Introducing a scattering model, we develop a method to measure the nonequilibrium electron dephasing time, which becomes very short at high voltages and magnetic fields. The relevance of electron-electron interactions is discussed.
Journal
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- Physical Review B
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Physical Review B 67 2003-01-29
American Physical Society (APS)
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Details 詳細情報について
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- CRID
- 1873398392643230720
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- ISSN
- 10953795
- 01631829
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- Data Source
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- OpenAIRE