Aharonov-Bohm effect of a quantum ring in the Kondo regime

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

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Date of publication of this fulltext: 15 Dec 2009 08:58

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Abstract

We investigate a small tuneable quantum ring fabricated by direct local oxidation using an atomic force microscope. The device contains very few electrons and is tuned into the Kondo regime. We study this Kondo effect by temperature dependent measurements. At finite bias voltages we observe additional peaks. These vanish with increasing temperature indicating Kondo correlations for these excited ...

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