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Thomas Pohl

Collective energy absorption of ultracold plasmas through electronic edge-modes

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We investigate the collective dynamics of electrons in ultracold neutral plasmas driven by an oscillating radio-frequency field. We point out the importance of a sharp density drop at the plasma boundary that arises due to unavoidable charge imbalances, and show that this plasma edge provides the major mechanism for energy absorption from the external field. Using a cold fluid theory, we derive the corresponding absorption frequency and validate our findings by microscopic molecular dynamics simulations. The proposed edge-mode is shown to provide a consistent explanation for the observed absorption spectra measured in different experiments. Understanding the response of the electronic plasma component to weak external driving is essential since it grants experimental access to the time-evolving density and temperature of ultracold plasmas.

Original languageEnglish
Article number053039
JournalNew Journal of Physics
Volume14
Number of pages14
ISSN1367-2630
DOIs
Publication statusPublished - 25 May 2012
Externally publishedYes

    Research areas

  • NEUTRAL PLASMAS, EXPANSION, COLD, OSCILLATIONS

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