Dynamics of vortex formation in merging Bose-Einstein condensate fragments

R. Carretero-González, Brian P Anderson, P. G. Kevrekidis, D. J. Frantzeskakis, C. N. Weiler

Research output: Contribution to journalArticle

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Abstract

We study the formation of vortices in a Bose-Einstein condensate (BEC) that has been prepared by allowing isolated and independent condensed fragments to merge together. We focus on the experimental setup of Scherer [Phys. Rev. Lett. 98, 110402 (2007)], where three BECs are created in a magnetic trap that is segmented into three regions by a repulsive optical potential; the BECs merge together as the optical potential is removed. First, we study the two-dimensional case; in particular, we examine the effects of the relative phases of the different fragments and the removal rate of the optical potential on the vortex formation. We find that many vortices are created by instant removal of the optical potential regardless of relative phases, and that fewer vortices are created if the intensity of the optical potential is gradually ramped down and the condensed fragments gradually merge. In all cases, self-annihilation of vortices of opposite charge is observed. We also find that for sufficiently long barrier ramp times, the initial relative phases between the fragments leave a clear imprint on the resulting topological configuration. Finally, we study the three-dimensional system and the formation of vortex lines and vortex rings due to the merger of the BEC fragments; our results illustrate how the relevant vorticity is manifested for appropriate phase differences, as well as how it may be masked by the planar projections observed experimentally.

Original languageEnglish (US)
Article number033625
JournalPhysical Review A
Volume77
Issue number3
DOIs
StatePublished - Mar 27 2008

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Bose-Einstein condensates
fragments
vortices
vortex rings
ramps
vorticity
projection
traps
rings
configurations

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

Carretero-González, R., Anderson, B. P., Kevrekidis, P. G., Frantzeskakis, D. J., & Weiler, C. N. (2008). Dynamics of vortex formation in merging Bose-Einstein condensate fragments. Physical Review A, 77(3), [033625]. https://doi.org/10.1103/PhysRevA.77.033625

Dynamics of vortex formation in merging Bose-Einstein condensate fragments. / Carretero-González, R.; Anderson, Brian P; Kevrekidis, P. G.; Frantzeskakis, D. J.; Weiler, C. N.

In: Physical Review A, Vol. 77, No. 3, 033625, 27.03.2008.

Research output: Contribution to journalArticle

Carretero-González, R, Anderson, BP, Kevrekidis, PG, Frantzeskakis, DJ & Weiler, CN 2008, 'Dynamics of vortex formation in merging Bose-Einstein condensate fragments', Physical Review A, vol. 77, no. 3, 033625. https://doi.org/10.1103/PhysRevA.77.033625
Carretero-González R, Anderson BP, Kevrekidis PG, Frantzeskakis DJ, Weiler CN. Dynamics of vortex formation in merging Bose-Einstein condensate fragments. Physical Review A. 2008 Mar 27;77(3). 033625. https://doi.org/10.1103/PhysRevA.77.033625
Carretero-González, R. ; Anderson, Brian P ; Kevrekidis, P. G. ; Frantzeskakis, D. J. ; Weiler, C. N. / Dynamics of vortex formation in merging Bose-Einstein condensate fragments. In: Physical Review A. 2008 ; Vol. 77, No. 3.
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