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Related Experiment Videos

Mermin-ho vortex in ferromagnetic spinor Bose-Einstein condensates.

T Mizushima1, K Machida, T Kita

  • 1Department of Physics, Okayama University, Okayama 700-8530, Japan.

Physical Review Letters
|July 30, 2002
PubMed
Summary

Coreless vortices in ferromagnetic Bose-Einstein condensates are stable under rotation, as shown by Gross-Pitaevskii equation calculations. A phase diagram reveals stability across varying rotation and magnetization levels.

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Area of Science:

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

Background:

  • Ferromagnetic spinor Bose-Einstein condensates (BECs) exhibit complex vortex structures.
  • Coreless vortices, such as Mermin-Ho and Anderson-Toulouse types, are theoretical possibilities in such systems.
  • Understanding vortex stability is crucial for controlling BEC properties.

Purpose of the Study:

  • To investigate the thermodynamic stability of Mermin-Ho and Anderson-Toulouse coreless vortices.
  • To establish the phase diagram for coreless vortex stability in rotating F=1 ferromagnetic BECs.
  • To compare the stability of coreless vortices against other vortex types.

Main Methods:

  • Solving the Gross-Pitaevskii equations for a uniform density approximation along the z-axis.

Related Experiment Videos

  • Calculating the energies of coreless vortices and competing non-axis-symmetric or singular vortices.
  • Analyzing collective modes using Bogoliubov equations to confirm stability.

    • Main Results:

    • Mermin-Ho and Anderson-Toulouse coreless vortices are thermodynamically stable in rotating F=1 ferromagnetic BECs.
    • A phase diagram was established, mapping stable regions based on rotation drive and total magnetization.
    • Stability was confirmed through energy comparisons and Bogoliubov mode calculations.

    Conclusions:

    • Coreless vortices represent a stable topological defect in rotating ferromagnetic spinor BECs.
    • The established phase diagram provides a guide for experimentally realizing and controlling these stable vortex states.
    • This work deepens the understanding of quantum vortex dynamics in magnetic BECs.