Electro-magnetic Aharonov-Bohm effect in a 2-D electron gas ring
Abstract
We define a mesoscopic ring in a 2-dimensional electron gas (2DEG) 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 new method to measure the non-equilibrium electron dephasing time, which becomes very short at high voltages and magnetic fields. The relevance of electron-electron interactions is discussed.
Cite
@article{arxiv.cond-mat/0107482,
title = {Electro-magnetic Aharonov-Bohm effect in a 2-D electron gas ring},
author = {W. G. van der Wiel and Yu. V. Nazarov and S. De Franceschi and T. Fujisawa and J. M. Elzerman and E. W. G. M. Huizeling and S. Tarucha and L. P. Kouwenhoven},
journal= {arXiv preprint arXiv:cond-mat/0107482},
year = {2009}
}
Comments
4 pages, 4 figures