Singlet-triplet transition tuned by asymmetric gate voltages in a quantum ring |
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Authors: | Fuhrer A Ihn T Ensslin K Wegscheider W Bichler M |
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Institution: | Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland. |
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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 ring. A gate tunable singlet-triplet transition of the two uppermost levels of this many-electron ring is identified at zero magnetic field. |
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