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Quantum Bubbles in Microgravity.

A Tononi1, F Cinti2,3,4, L Salasnich1,5

  • 1Dipartimento di Fisica e Astronomia "Galileo Galilei," Università di Padova, via Marzolo 8, Padova 35131, Italy.

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|July 18, 2020
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Summary
This summary is machine-generated.

Microgravity experiments reveal that bubble traps significantly reduce the critical temperature for Bose-Einstein condensation in ultracold atoms. These hollow condensates exhibit self-interference during expansion, demonstrating superfluidity in thin shells.

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Area of Science:

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

Background:

  • Microgravity experiments are advancing the study of ultracold atoms.
  • Bose-Einstein condensates (BECs) in shell-shaped ellipsoidal traps present unique research opportunities.
  • Understanding the properties of BECs in non-standard trap geometries is crucial for quantum technologies.

Purpose of the Study:

  • To calculate the critical temperature for Bose-Einstein condensation in shell-shaped ellipsoidal traps.
  • To simulate the density distribution and free expansion dynamics of hollow BECs.
  • To investigate superfluidity in mesoscopic, strongly interacting BECs within thin shells.

Main Methods:

  • Calculation of critical temperature using realistic bubble-trap parameters.
  • Zero-temperature density distribution simulation via the Gross-Pitaevskii equation.
  • Quantum Monte Carlo simulations for strongly interacting regimes.

Main Results:

  • A significant reduction in critical temperature compared to bare harmonic traps was observed.
  • Hollow condensates exhibit self-interference during free expansion, filling the central hole.
  • Quantum Monte Carlo simulations confirm superfluidity in the thin shell due to its topology.

Conclusions:

  • Bubble traps offer a novel platform for studying BECs with reduced critical temperatures.
  • The observed self-interference and superfluidity highlight the unique properties of hollow condensates.
  • This work provides a benchmark for future research using bubble traps in microgravity.