Ground-state energy and spin in disordered quantum dots

Details Ground-state energy and spin in disordered quantum dots Ground-state energy and spin in disordered quantum dots

2002-02-15

arxiv.org/abs/cond-mat/0202266v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 2 figures

Scientific paper

10.1103/PhysRevB.65.193305

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.

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