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Summary
This summary is machine-generated.

We experimentally observed quantum interference counteracting Fermi acceleration in ultracold gases. This study explores distinct diffusion regimes and quantum transport phenomena.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Statistical mechanics

Background:

  • Anderson localization halts quantum transport via destructive interference.
  • Fermi acceleration, driven by time-dependent random forces, enhances transport and is linked to cosmic rays.
  • The interplay between these phenomena is complex, with limited experimental data.

Purpose of the Study:

  • To experimentally investigate the dynamics of an ultracold Fermi gas in time-dependent disorder.
  • To explore the competition between Anderson localization and Fermi acceleration.
  • To observe distinct transport regimes (sub- to superdiffusion) in this driven quantum system.

Main Methods:

  • Expansion of an ultracold Fermi gas.
  • Introduction of time-dependent disorder.
  • Observation of transport regimes using experimental measurements.

Main Results:

  • Observed distinct sub- to superdiffusion regimes.
  • Found that quantum interference unexpectedly counteracts Fermi acceleration in strong disorder.
  • Identified a transition to a diffusive state in the driven system.

Conclusions:

  • The study reveals complex dynamics arising from the competition between quantum interference and Fermi acceleration.
  • The experimental system provides a platform for investigating Fermi acceleration within the quantum transport regime.
  • Findings challenge simple models by showing interference effects on driven transport.