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

J. A. Folk, C. M. Marcus, R. Berkovits, I. L. Kurland, I. L. Aleiner, B. L. Altshuler

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47 Scopus citations

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 languageEnglish
Pages (from-to)26-33
Number of pages8
JournalPhysica Scripta
Volume90
DOIs
StatePublished - 2001
EventNobel Symposium 116 - Backaskog Castle, Sweden
Duration: 13 Jun 200017 Jun 2000

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