Denis Ullmo 1, 2, Tatsuro Nagano 3, Steven Tomsovic 3
Physical Review Letters 90 (2003) 176801
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.
- 1. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
CNRS : UMR8626 – Université Paris XI – Paris Sud - 2. Duke Physics,
Duke University - 3. Department of Physics,
Washington State University