Fano effect in a quantum-ring–quantum-dot system with tunable coupling

A. Fuhrer, P. Brusheim, T. Ihn, M. Sigrist, K. Ensslin, W. Wegscheider, and M. Bichler
Phys. Rev. B 73, 205326 – Published 12 May 2006

Abstract

Transport measurements are presented on a quantum ring that is tunnel-coupled to a quantum dot. When the dot is in the Coulomb blockade regime, but strongly coupled to the open ring, Fano line shapes are observed in the current through the ring, when the electron number in the dot changes by 1. The symmetry of the Fano resonances is found to depend on the magnetic flux penetrating the area of the ring and on the strength of the ring–dot coupling. At temperatures above T=0.65K the Fano effect disappears, while the Aharonov-Bohm interference in the ring persists up to T=4.2K. Good agreement is found between these experimental observations and a single-channel scattering matrix model including decoherence in the dot.

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  • Received 20 February 2006

DOI:https://doi.org/10.1103/PhysRevB.73.205326

©2006 American Physical Society

Authors & Affiliations

A. Fuhrer1,2, P. Brusheim1, T. Ihn2, M. Sigrist2, K. Ensslin2, W. Wegscheider3, and M. Bichler4

  • 1Solid State Physics/Nanometer Consortium, Lund University, S-221 00 Lund, Sweden
  • 2Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
  • 3Institut für experimentelle und angewandte Physik, Universität Regensburg, Germany
  • 4Walter Schottky Institut, Technische Universität München, Germany

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Issue

Vol. 73, Iss. 20 — 15 May 2006

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