Spin and conductance-peak-spacing distributions in large quantum dots: a density-functional theory study.
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.
Jiang
Hong
H
Department of Chemistry, Duke University, Durham, North Carolina 27708-0354, USA.
Baranger
Harold U
HU
Yang
Weitao
W