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Diffusive to Nonergodic Dipolar Transport in a Dissipative Atomic Medium.

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We studied how Rydberg impurities move in ultracold atoms. Dissipation controls impurity spreading, which can be frozen, revealing a nonergodic phase for transport studies.

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Area of Science:

  • Atomic physics
  • Quantum simulation
  • Condensed matter physics

Background:

  • Rydberg atoms are highly excited atoms with unique properties.
  • Understanding transport phenomena is crucial in quantum systems.
  • Controllable dissipation offers new avenues for quantum control.

Purpose of the Study:

  • Investigate dipole-mediated transport of Rydberg impurities.
  • Explore the role of dissipation in controlling atomic transport.
  • Study transport and localization in systems with long-range interactions.

Main Methods:

  • Utilizing ultracold atoms prepared in auxiliary Rydberg states.
  • Employing in-situ imaging to observe impurity dynamics.
  • Comparing experimental results with numerical simulations of coherent evolution.

Main Results:

  • Diffusive spreading of impurities observed, controlled by probe laser intensity.
  • Spreading was frozen upon switching off dressing fields.
  • Numerical simulations confirmed a transition to a nonergodic extended phase.

Conclusions:

  • Dissipation effectively controls transport dynamics of Rydberg impurities.
  • The system exhibits nonergodic behavior, allowing study of localization.
  • This work provides a platform for exploring long-range transport and dissipation effects.