Ground state spin and Coulomb blockade peak motion in chaotic quantum dots
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.
Cite
@article{arxiv.cond-mat/0010441,
title = {Ground state spin and Coulomb blockade peak motion in chaotic quantum dots},
author = {J. A. Folk and C. M. Marcus and R. Berkovits and I. L. Kurland and I. L. Aleiner and B. L. Altshuler},
journal= {arXiv preprint arXiv:cond-mat/0010441},
year = {2009}
}
Comments
To appear in Proceedings of the Nobel Symposium 2000 (Physica Scripta)