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Aharonov–Bohm oscillations of a tuneable quantum ring

DOI to cite this document:
10.5283/epub.11305
Keyser, U. F. ; Borck, S. ; Haug, R. J. ; Abstreiter, Gerhard ; Bichler, Max ; Wegscheider, Werner
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Date of publication of this fulltext: 07 Dec 2009 13:07


Abstract

Using an atomic force microscope a ring geometry with self-aligned in-plane gates was directly written into a GaAs/AlGaAs heterostructure. Transport measurements in the open regime show only one transmitting mode and Aharonov–Bohm oscillations with more than 50% modulation are observed in the conductance. The tuning via in-plane gates allows one to study the Aharonov–Bohm effect in the whole range from the open ring to the Coulomb-blockade regime.


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