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We use spin-density-functional theory to study the spacing betweenconductance peaks and the ground-state spin of 2D model quantum dots with up to200 electrons. Distributions for different ranges of electron number areobtained in both symmetric and asymmetric potentials. The even/odd effect ispronounced for small symmetric dots but vanishes for large asymmetric ones,suggesting substantially stronger interaction effects than expected. Thefraction of high-spin ground states is remarkably large.Comment: 4 pages, 3 figure

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