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Ultracold Bose Gases in Dynamic Disorder with Tunable Correlation Time.

Benjamin Nagler1, Martin Will1, Silvia Hiebel1

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|June 24, 2022
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Summary
This summary is machine-generated.

Ultracold bosonic gases subjected to dynamic disorder exhibit unique dissipative behaviors. Particle losses in Bose-Einstein condensates depend on correlation time, influenced by heating or superfluid excitations.

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Area of Science:

  • Atomic, Molecular & Optical Physics
  • Condensed Matter Physics
  • Quantum Gases

Background:

  • Ultracold atomic gases provide a controllable platform for studying quantum phenomena.
  • Understanding dissipation in quantum systems is crucial for their technological application.
  • Dynamic disorder introduces time-dependent perturbations, impacting system stability and dynamics.

Purpose of the Study:

  • To experimentally investigate the dissipative dynamics of ultracold bosonic gases in a dynamic disorder potential.
  • To model the microscopic origins of dissipation in thermal clouds and Bose-Einstein condensates.
  • To explore the influence of tunable correlation times on heating and particle loss rates.

Main Methods:

  • Experimental measurement of heating rates in thermal clouds exposed to dynamic disorder.
  • Experimental measurement of particle loss rates in Bose-Einstein condensates.
  • Development of rate models to describe dissipation mechanisms.

Main Results:

  • A model for the heating process in thermal clouds was developed, identifying the microscopic origin of dissipation.
  • Particle loss rates in Bose-Einstein condensates were measured and found to depend on the correlation time of the disorder.
  • Loss mechanisms were identified as either dominated by heating of thermal particles or creation of excitations in the superfluid.

Conclusions:

  • Dissipative dynamics in ultracold bosonic gases are sensitive to the correlation time of dynamic disorder.
  • Ultracold atoms serve as a versatile platform for studying spatiotemporal noise and time-dependent disorder effects.
  • The interplay between superfluidity and time-dependent disorder was illuminated.