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.

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Document Details

Document Type
Technical Report
Publication Date
Oct 27, 2000
Accession Number
AD1004580

Entities

People

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

Organizations

  • Harvard University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carbon Nanotubes
  • Couplings
  • Data Analysis
  • Diffusion Coefficient
  • Electron Electron Interactions
  • Electron Gas
  • Electrons
  • Ground State
  • Low Temperature
  • Magnetic Fields
  • Magnetization
  • Quantum Dots
  • Quantum Properties
  • Spin States
  • Spin-Orbit Interaction
  • Statistics
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Molecular Photonics/Laser Physics
  • Vision Science/Vision Psychology/Cognitive Neuroscience.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots
  • Space