Kondo Effect in a Few-Electron Quantum Ring

DOI to cite this document:: 10.5283/epub.11343

Keyser, U. F. ; Fühner, C. ; Borck, S. ; Haug, R. J. ; Bichler, Max ; Abstreiter, Gerhard ; Wegscheider, Werner

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Date of publication of this fulltext: 14 Dec 2009 13:13

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Abstract

A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by π at the Coulomb-blockade ...