Ground-state energy and spin in disordered quantum dots
Mesoscale and Nanoscale Physics
2009-11-07 v1
Abstract
We investigate the ground-state energy and spin of disordered quantum dots using spin-density-functional theory. Fluctuations of addition energies (Coulomb-blockade peak spacings) do not scale with average addition energy but remain proportional to level spacing. With increasing interaction strength, the even-odd alternation of addition energies disappears, and the probability of non-minimal spin increases, but never exceeds 50%. Within a two-orbital model, we show that the off-diagonal Coulomb matrix elements help stabilize a ground state of minimal spin.
Cite
@article{arxiv.cond-mat/0202266,
title = {Ground-state energy and spin in disordered quantum dots},
author = {Kenji Hirose and Ned S. Wingreen},
journal= {arXiv preprint arXiv:cond-mat/0202266},
year = {2009}
}
Comments
10 pages, 2 figures