2020/10/23 by L. A. Williamson, Lewis A. Williamson, P. B. Blakie
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Cold Atom Physics and Bose-Einstein Condensates #Coupling (piping) #Crossover #Ferromagnetism #Phase (matter) #Phenomenological model #Spin (aerodynamics) #Strong Light-Matter Interactions #Vortex #Zeeman effect #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevresearch.3.013154
published as Phys. Rev. Research 3, 013154 (2021) · 12 pages, 7 figures
arxiv created 2020/10/23 · openalex created_date 2020/10/29 · openalex publication_date 2021/02/17 · arxiv updated 2021/02/24 · openalex updated_date 2026/08/05
Ferromagnetic spin-1 Bose-Einstein condensates in the broken-axisymmetric phase support polar-core spin vortices (PCVs), which are intimately linked to the nonequilibrium dynamics of the system. For a purely transversely magnetized system, the Turner point-vortex model predicts that PCVs behave like massive charged particles interacting via a two-dimensional Coulomb potential. We test the accuracy of the Turner model for two oppositely charged PCVs, via comparisons with numerical simulations. While the bare Turner model shows discrepancies with our numerical results, we find that a simple rescaling of the PCV mass gives much better agreement. This can be explained via a phenomenological damping arising from coupling to modes extrinsic to the point-vortex phase space. We also identify the excitations produced following PCV annihilation, which help elucidate recent phase ordering results. We extend the Turner model to cases where the system is magnetized both transversally and axially, identifying a crossover to scalar vortex dynamics for increasing external Zeeman field.