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Autoionizing Polaritons in Attosecond Atomic Ionization.

N Harkema1, C Cariker2, E Lindroth3

  • 1Department of Physics, University of Arizona, Tucson, Arizona 85721, USA.

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|July 23, 2021
PubMed
Summary
This summary is machine-generated.

Researchers explored entangled light-matter states in argon using attosecond spectroscopy. They achieved controllable stabilization of autoionizing polaritons against ionization, revealing new optical control methods.

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Area of Science:

  • Quantum optics
  • Attosecond spectroscopy
  • Atomic physics

Background:

  • Laser-dressed atoms exhibit light-induced states and Autler-Townes splitting in photoionization spectra.
  • The entangled light-matter nature of metastable Autler-Townes multiplets as autoionizing polaritons remains underexplored.

Purpose of the Study:

  • Investigate the formation of polariton multiplets in laser-dressed argon.
  • Explore the controllable stabilization of these autoionizing polaritons against ionization.
  • Understand the underlying mechanisms of stabilization using theoretical models.

Main Methods:

  • Attosecond transient-absorption spectroscopy (ATAS) on argon.
  • Ab initio theoretical calculations.
  • Extension of the Jaynes-Cummings model to autoionizing states.

Main Results:

  • Observed controllable stabilization of polariton multiplets against ionization.
  • Achieved excellent agreement between experimental data and ab initio theory.
  • Demonstrated stabilization arises from destructive interference between Auger decay and radiative ionization.

Conclusions:

  • New insights into optical control of electronic structure in the continuum.
  • Potential applications of radiative stabilization in metastable polyelectronic systems.
  • Experimental and theoretical validation of autoionizing polariton stabilization.