Electromagnetic Aharonov-Bohm effect in a two-dimensional electron gas ring

W. G. van der Wiel, Yu. V. Nazarov, S. De Franceschi, T. Fujisawa, J. M. Elzerman, E. W. G. M. Huizeling, S. Tarucha, and L. P. Kouwenhoven
Phys. Rev. B 67, 033307 – Published 29 January 2003
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Abstract

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.

  • Received 13 June 2002

DOI:https://doi.org/10.1103/PhysRevB.67.033307

©2003 American Physical Society

Authors & Affiliations

W. G. van der Wiel1,2, Yu. V. Nazarov2, S. De Franceschi2,*, T. Fujisawa3, J. M. Elzerman2,*, E. W. G. M. Huizeling2, S. Tarucha3,4,*, and L. P. Kouwenhoven1,2,*

  • 1PRESTO, Japan Science and Technology Corporation (JST), Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
  • 2Department of NanoScience and DIMES, Delft University of Technology, PO Box 5046, 2600GA Delft, The Netherlands
  • 3NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan
  • 4Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

  • *Also at ERATO Mesoscopic Correlation Project.

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Issue

Vol. 67, Iss. 3 — 15 January 2003

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