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

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

2002-08-07

arxiv.org/abs/cond-mat/0208146v1

Phys. Rev. Lett. 90, 026806 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.026806

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.

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