Phys. Rev. Lett. 91, 206802 (2003) [4 pages]Singlet-Triplet Transition Tuned by Asymmetric Gate Voltages in a Quantum RingReceived 20 June 2003; published 14 November 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.206802
DOI:
10.1103/PhysRevLett.91.206802
PACS:
73.23.–b, 03.67.Lx
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