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Area of Science:

  • Quantum physics
  • Atomic physics
  • Wave phenomena

Background:

  • Understanding wave scattering in disordered media is key for phenomena like Anderson localization.
  • The elastic scattering time (τs) quantifies wave scattering strength.
  • Disordered potentials are crucial for studying wave transport in ultracold atom systems.

Purpose of the Study:

  • To extensively study the elastic scattering time (τs) of matter waves in optical disordered potentials.
  • To investigate the behavior of τs across weak to strong scattering regimes (over 3 orders of magnitude).
  • To reveal the influence of disorder statistics on scattering properties and established criteria.

Main Methods:

  • Direct experimental measurements of τs.
  • Numerical simulations of wave scattering.
  • Comparison with first-order Born approximation using known disorder properties.

Main Results:

  • The elastic scattering time (τs) was explored over more than 3 orders of magnitude.
  • The crossover from weak to strong scattering was analyzed in detail.
  • Disorder statistics strongly influence scattering, particularly the Ioffe-Regel-like criterion (kls∼1).
  • The Ioffe-Regel criterion is relevant for Gaussian disorder but deviates significantly for laser speckle disorder.

Conclusions:

  • Disorder statistics critically affect wave scattering in disordered potentials.
  • The commonly used Ioffe-Regel criterion requires re-evaluation for specific disorder types, like laser speckle.
  • These findings are vital for linking experimental transport phenomena (e.g., Anderson localization) with microscopic theories in ultracold atom systems.