Fano regime of one-dot Aharonov-Bohm interferometers

Valeriu Moldoveanu, Mugurel Ţolea, Vidar Gudmundsson, and Andrei Manolescu
Phys. Rev. B 72, 085338 – Published 24 August 2005

Abstract

We use the Landauer-Büttiker formalism to study the mesoscopic Fano effect in Aharonov-Bohm rings with an embedded two-dimensional noninteracting dot. The magnetic field dependence of the dot levels leads to a global shift of the Fano lines which becomes important for small ring/dot area ratios. As the magnetic field is varied the Fano dips move periodically from one side of the peak to the other, as reported by Kobayashi et al. [Phys. Rev. Lett. 88, 256806 (2002)]. We show that this effect appears due to a specific magnetic control of the difference between the phase of the single nonresonant path via the free arm of the ring and the global phase of all trajectories involving resonant tunnelings through the dot.

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  • Received 17 January 2005

DOI:https://doi.org/10.1103/PhysRevB.72.085338

©2005 American Physical Society

Authors & Affiliations

Valeriu Moldoveanu1, Mugurel Ţolea1, Vidar Gudmundsson2, and Andrei Manolescu1,2

  • 1National Institute of Materials Physics, P.O. Box MG-7, Bucharest-Magurele, Romania
  • 2Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland

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Vol. 72, Iss. 8 — 15 August 2005

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