Ground-state energy and spin in disordered quantum dots

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.

10 pages, 2 figures

References in corpus (2)

• The Statistical Theory of Quantum Dots
• Quantum Effects in Coulomb Blockade

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