Singlet-Triplet Transition Tuned by Asymmetric Gate Voltages in a Quantum Ring
arXiv:cond-mat/0306667 · doi:10.1103/PhysRevLett.91.206802
Abstract
Wavefunction 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.
4 pages
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