Accession Number:

AD1004580

Title:

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

Descriptive Note:

Journal Article

Corporate Author:

Harvard University Cambridge United States

Personal Author(s):

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

Report Date:

2000-10-27

Pagination or Media Count:

8.0

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.

Descriptors:

• magnetic fields
• quantum dots
• ground state
• spin states
• probability
• electrons

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE