Tuning of the Fano Effect through a Quantum Dot in an Aharonov-Bohm Interferometer

Kensuke Kobayashi, Hisashi Aikawa, Shingo Katsumoto, and Yasuhiro Iye
Phys. Rev. Lett. 88, 256806 – Published 10 June 2002
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Abstract

The Fano effect, which arises from an interference between a localized state and the continuum, reveals a fundamental aspect of quantum mechanics. We have realized a tunable Fano system in a quantum dot (QD) in an Aharonov-Bohm interferometer, which is the first convincing demonstration of this effect in mesoscopic systems. With the aid of the continuum, the localized state inside the QD acquires itinerancy over the system even in the Coulomb blockade. Through tuning of the parameters, which is an advantage of the present system, unique properties of the Fano effect on the phase and coherence of electrons have been revealed.

  • Received 5 February 2002

DOI:https://doi.org/10.1103/PhysRevLett.88.256806

©2002 American Physical Society

Authors & Affiliations

Kensuke Kobayashi, Hisashi Aikawa, Shingo Katsumoto*, and Yasuhiro Iye

  • Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan

  • *Also at CREST, Japan Science and Technology Corporation, Mejiro, Tokyo 171-0031, Japan.

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Issue

Vol. 88, Iss. 25 — 24 June 2002

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