Ground state spin and Coulomb blockade peak motion in chaotic quantum dots

Details Ground state spin and Coulomb blockade peak motion in chaotic quantum dots Ground state spin and Coulomb blockade peak motion in chaotic quantum dots

2000-10-27

arxiv.org/abs/cond-mat/0010441v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Proceedings of the Nobel Symposium 2000 (Physica Scripta)

Scientific paper

10.1238/Physica.Topical.090a0002

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.

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