Coarsening dynamics driven by vortex-antivortex annihilation in ferromagnetic Bose-Einstein condensates

Kazue Kudo, Yuki Kawaguchi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

In ferromagnetic Bose-Einstein condensates (BECs), the quadratic Zeeman effect controls magnetic anisotropy, which affects magnetic domain pattern formation. While the longitudinal magnetization is dominant (similar to the Ising model) for a negative quadratic Zeeman energy, the transverse magnetization is dominant (similar to the XY model) for a positive one. When the quadratic Zeeman energy is positive, the coarsening dynamics is driven by vortex-antivortex annihilation in the same way as the XY model. However, due to a superfluid flow of atoms, there exist several combinations of vortex-antivortex pairs in ferromagnetic BECs, which makes the coarsening dynamics more complicated than that of the XY model. We propose a revised domain growth law, which is based on the growth law of the two-dimensional XY model, for a two-dimensional ferromagnetic BEC with a positive quadratic Zeeman energy.

Original languageEnglish
Article number053609
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume91
Issue number5
DOIs
Publication statusPublished - 2015 May 12
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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