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Singlet-Triplet Transition Tuned by Asymmetric Gate Voltages in a Quantum Ring

DOI to cite this document:
Fuhrer, A. ; Ihn, Thomas ; Ensslin, Klaus ; Wegscheider, Werner ; Bichler, Max
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Date of publication of this fulltext: 15 Dec 2009 08:55


Wave-function and interaction effects in the addition spectrum of a Coulomb-blockaded many-electron quantum ring are investigated as a function of asymmetrically applied gate voltages and magnetic field. Hartree and exchange contributions to the interaction are quantitatively evaluated at a crossing between states extended around the ring and states which are more localized in one arm of the ...


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