Nonlinear dynamics of electron-positron clusters

Abstract

Electron-positron clusters are studied using a quantum hydrodynamic model that includes Coulomb and exchange interactions. A variational Lagrangian method is used to determine their stationary and dynamical properties. The cluster static features are validated against existing Hartree-Fock calculations. In the linear response regime, we investigate both dipole and monopole (breathing) modes. The dipole mode is reminiscent of the surface plasmon mode usually observed in metal clusters. The nonlinear regime is explored by means of numerical simulations. We show that, by exciting the cluster with a chirped laser pulse with slowly varying frequency (autoresonance), it is possible to efficiently separate the electron and positron populations on a timescale of a few tens of femtoseconds.

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Cited by in corpus (5)

• High-harmonic generation in a quantum electron gas trapped in a nonparabolic and anisotropic well
• Variational approach to the time-dependent Schrödinger-Newton equations
• Phase space methods for the spin dynamics in condensed matter systems
• Dynamics of antiproton plasma in a time-dependent harmonic trap
• Influence of the electron spill-out and nonlocality on gap-plasmons in the limit of vanishing gaps