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Observation of Fermi Acceleration with Cold Atoms.

G Barontini1, V Naniyil1, J P Stinton1

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Summary
This summary is machine-generated.

Scientists created a controllable Fermi accelerator using ultracold atoms. This laboratory model mimics cosmic ray acceleration, producing high-velocity atomic jets and enabling new studies in astrophysics and quantum technology.

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Area of Science:

  • Astrophysics
  • Quantum Technology
  • Atomic Physics

Background:

  • Cosmic rays are accelerated by Fermi acceleration, a process involving particle scattering off magnetic fluctuations in astrophysical plasmas.
  • Fermi acceleration is a universal process with classical and quantum formulations, underpinning dynamical systems like the Fermi-Ulam model.
  • Direct experimental verification of Fermi acceleration in laboratory settings has been challenging.

Purpose of the Study:

  • To realize a fully controllable laboratory Fermi accelerator.
  • To study Fermi acceleration using ultracold atoms and engineered potential barriers.
  • To experimentally test theoretical arguments regarding energy spectra in accelerating systems.

Main Methods:

  • Development of a micro-scale (100 μm) Fermi accelerator.
  • Collision of ultracold atoms against engineered, movable potential barriers.
  • Introduction of dissipation to test Bell's argument for energy spectra.

Main Results:

  • Successful creation of a controllable Fermi accelerator.
  • Generation of ultracold atomic jets with velocities exceeding 0.5 m/s.
  • Experimental validation of Bell's argument for energy spectra in an accelerating system.

Conclusions:

  • The study opens avenues for using cold atoms to investigate high-energy astrophysics phenomena.
  • The demonstrated Fermi accelerator offers a simpler implementation compared to existing quantum technologies.
  • The performance is competitive with state-of-the-art accelerating methods in quantum technology and colliders.