## 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 strength, 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.

Original language | English |
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Pages (from-to) | 26-33 |

Number of pages | 8 |

Journal | Physica Scripta |

Volume | 90 |

DOIs | |

State | Published - 2001 |

Event | Nobel Symposium 116 - Backaskog Castle, Sweden Duration: 13 Jun 2000 → 17 Jun 2000 |