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

DOI to cite this document:: 10.5283/epub.11485

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

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Abstract

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 ...