Spin and Conductance-Peak-Spacing Distributions in Large Quantum Dots: A Density Functional Theory Study

Abstract

We use spin-density-functional theory to study the spacing between conductance peaks and the ground-state spin of 2D model quantum dots with up to 200 electrons. Distributions for different ranges of electron number are obtained in both symmetric and asymmetric potentials. The even/odd effect is pronounced for small symmetric dots but vanishes for large asymmetric ones, suggesting substantially stronger interaction effects than expected. The fraction of high-spin ground states is remarkably large.

4 pages, 3 figures

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• Exchange and the Coulomb blockade: Peak height statistics in quantum dots
• Local correlation functional for electrons in two dimensions
• Addition Energies of Fullerenes and Nanotubes as Quantum Dots: The Role of Symmetry
• Disordered mesoscopic systems with interactions: induced two-body ensembles and the Hartree-Fock approach
• Electron correlations in metal nanoparticles with spin-orbit scattering
• Electron-Electron Interactions in Isolated and Realistic Quantum Dots: A Density Functional Theory Study
• Landau Fermi Liquid Picture of Spin Density Functional Theory: Strutinsky Approach to Quantum Dots
• Analysis of vibrational normal modes for Coulomb clusters
• Spontaneous Magnetization and Electron Momentum Density in 3D Quantum Dots
• Spin Effects in a Quantum Ring
• Active Brownian Motion in Threshold Distribution of a Coulomb Blockade Model
• Interaction Effects in the Mesoscopic Regime: A Quantum Monte Carlo Study of Irregular Quantum Dots
• Influence of the nature of confinement on the melting of Wigner molecules in quantum dots
• Static and Dynamic Properties of Two Dimensional Coulomb Clusters
• Spatio-temporal correlations in Wigner molecules
• Electron correlations, spontaneous magnetization and momentum density in quantum dots
• Significance of the nature of disorder on the universal features of the spatio-temporal correlations of two-dimensional Coulomb-clusters
• Interactions and Broken Time-Reversal Symmetry in Chaotic Quantum Dots