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

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

2003-06-26

arxiv.org/abs/cond-mat/0306667v1

Phys. Rev. Lett. 91 (20) 206802 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages

Scientific paper

10.1103/PhysRevLett.91.206802

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.

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