Kondo Effect in a Many-Electron Quantum Ring

A. Fuhrer, T. Ihn, K. Ensslin, W. Wegscheider, and M. Bichler
Phys. Rev. Lett. 93, 176803 – Published 19 October 2004

Abstract

The Kondo effect is investigated in a many-electron quantum ring as a function of the magnetic field. For fields applied perpendicular to the plane of the ring a modulation of the Kondo effect with the Aharonov-Bohm period is observed. This effect is discussed in terms of the energy spectrum of the ring and the parametrically changing tunnel coupling. In addition, we use gate voltages to modify the ground-state spin of the ring. The observed splitting of the Kondo-related zero-bias anomaly in this configuration is tuned with an in-plane magnetic field.

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  • Received 10 June 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.176803

©2004 American Physical Society

Authors & Affiliations

A. Fuhrer1, T. Ihn1, K. Ensslin1, W. Wegscheider2, and M. Bichler3

  • 1Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
  • 2Institut für experimentelle und angewandte Physik, Universität at Regensburg, 93040 Regensburg, Germany
  • 3Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany

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Issue

Vol. 93, Iss. 17 — 22 October 2004

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