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Interaction effects on dynamical localization in driven helium.

Felix Jörder1, Klaus Zimmermann1, Alberto Rodriguez1

  • 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, D-79104 Freiburg, Germany.

Physical Review Letters
|August 23, 2014
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Summary
This summary is machine-generated.

Dynamical localization in atomic systems prevents fragmentation. Electron-electron interactions do not disrupt this effect in helium Rydberg atoms, even with autoionization.

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Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Quantum chaos

Background:

  • Driven atomic systems are susceptible to fragmentation.
  • Dynamical localization is a known phenomenon that inhibits excitation and fragmentation.

Purpose of the Study:

  • To investigate the effect of electron-electron interactions on dynamical localization in microwave-driven helium Rydberg atoms.
  • To determine if dynamical localization persists in the presence of electron-electron repulsion and autoionization.

Main Methods:

  • Numerical simulations using a collinear model.
  • Analysis of microwave-driven helium Rydberg atoms, including doubly excited states.
  • Consideration of electron-electron interaction and fast autoionization.

Main Results:

  • Dynamical localization is shown to survive the influence of electron-electron interactions.
  • The effect of electron-electron repulsion on localization can be effectively modeled by rescaling atomic properties.
  • This holds true even for doubly excited states susceptible to fast autoionization.

Conclusions:

  • Dynamical localization is a robust phenomenon in driven atomic systems, resistant to electron-electron interactions.
  • The interplay between electron-electron repulsion and localization can be quantitatively described through rescaling parameters.
  • Findings are relevant for understanding and controlling highly excited atomic states.