Quantum dot ground state energies and spin polarizations: soft versus hard chaos

Details Quantum dot ground state energies and spin polarizations: soft versus hard chaos Quantum dot ground state energies and spin polarizations: soft versus hard chaos

2002-11-19

arxiv.org/abs/cond-mat/0211412v1

Phys. Rev. Lett, 90 176801 (2003) ; Phys. Rev. Lett. 91, 179901(E) (2003).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.91.179901

We consider how the nature of the dynamics affects ground state properties of ballistic quantum dots. We find that ``mesoscopic Stoner fluctuations'', that arise from the residual screened Coulomb interaction, are very sensitive to the degree of chaos. It leads to ground state energies and spin-polarizations whose fluctuations strongly increase as a system becomes less chaotic. The crucial features are illustrated with a model that depends on a parameter that tunes the dynamics from nearly integrable to mostly chaotic.

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