Ground State Spin and Coulomb Blockade Peak Motion in Chaotic Quantum Dots

Authors:
  • CMC. M. Marcus
    C. M. Marcus
  • RBR. Berkovits
    R. Berkovits
  • IKI. L. Kurland
    I. L. Kurland
  • IAI. L. Aleiner
    I. L. Aleiner
  • BAB. L. Altshuler
    B. L. Altshuler
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Abstract
We investigate experimentally and theoretically the behavior of Coulomb blockade (CB) peaks in a magnetic field that couples principally to the ground-state spin (rather than the orbital moment) of a chaotic quantum dot. In the first part, we discuss numerically observed features in the magnetic field dependence of CB peak and spacings that unambiguously identify changes in spin S of each ground state for successive numbers of electrons on the dot, N. We next evaluate the probability that the ground state of the dot has a particular spin S, as a function of the exchange strength, J, and external magnetic field, B. In the second part, we describe recent experiments on gate-defined GaAs quantum dots in which Coulomb peak motion and spacing are measured as a function of in-plane magnetic field, allowing changes in spin between N and N+1 electron ground states to be inferred.Comment: To appear in Proceedings of the Nobel Symposium 2000 (Physica Scripta
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