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Related Experiment Videos

Phase-fluctuating 3D Bose-Einstein condensates in elongated traps.

D S Petrov1, G V Shlyapnikov, J T Walraven

  • 1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.

Physical Review Letters
|August 11, 2001
PubMed
Summary

In elongated Bose-Einstein condensates (BECs), a quasicondensate state with fluctuating phase exists below the BEC transition temperature. Suppressed fluctuations lead to a true condensate, enabling advanced thermometry for ultracold gases.

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Area of Science:

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

Background:

  • Bose-Einstein condensation (BEC) is a quantum state of matter formed by bosons cooled to near absolute zero.
  • Elongated three-dimensional (3D) trapped Bose gases present unique characteristics due to their geometry.
  • Understanding the equilibrium states and phase behavior of these systems is crucial for quantum gas research.

Purpose of the Study:

  • To investigate the equilibrium state of 3D trapped Bose gases in highly elongated geometries.
  • To determine the conditions under which a true Bose-Einstein condensate forms from a quasicondensate.
  • To explore the implications of phase fluctuations for thermometry in ultracold atomic gases.

Main Methods:

  • Theoretical modeling of 3D trapped Bose gases.

Related Experiment Videos

  • Analysis of phase fluctuations in elongated systems.
  • Investigation of temperature-dependent phase transitions.

    • Main Results:

    • In highly elongated 3D trapped Bose gases, the equilibrium state below the BEC transition temperature (Tc) is a 3D condensate with fluctuating phase (quasicondensate).
    • At sufficiently low temperatures, phase fluctuations are suppressed, transitioning the quasicondensate into a true condensate.
    • The existence and characteristics of these phase fluctuations offer a pathway for extending thermometry techniques for Bose-condensed gases.

    Conclusions:

    • Elongated 3D Bose gases exhibit a quasicondensate phase below Tc due to phase fluctuations.
    • The transition from quasicondensate to true condensate is temperature-dependent and governed by the suppression of phase fluctuations.
    • This research provides a foundation for developing novel thermometry methods in ultracold atomic systems.