Quantum rings as phase coherent detectors

DOI to cite this document:: 10.5283/epub.11815

Fuhrer, A. ; Sigrist, Martin ; Meier, L. ; Ihn, Thomas ; Ensslin, Klaus ; Wegscheider, Werner ; Bichler, Max

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Date of publication of this fulltext: 11 Jan 2010 13:16

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Abstract

Aharonov–Bohm oscillations are studied in the magnetoconductance through two micron-sized quantum rings. The structures are defined in a two-dimensional electron gas of a Ga[Al]As heterostructure by way of local oxidation with an atomic force microscope. In the experiments, the rings are used as phase-coherent detectors of the charge state of quantum dots coupled to the rings in two specific ...