Dynamically stable multiply quantized vortices in dilute Bose-Einstein condensates

Journal Article · Fri Dec 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.063619· OSTI ID:20976533

Huhtamaeki, J A. M.; Virtanen, S M. M. ^[1]; Moettoenen, M ^[1]

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1. Laboratory of Physics, Helsinki University of Technology, POB 4100, FI-02015 TKK (Finland)

Multiquantum vortices in dilute atomic Bose-Einstein condensates confined in long cigar-shaped traps are known to be both energetically and dynamically unstable. They tend to split into single-quantum vortices even in the ultralow temperature limit with vanishingly weak dissipation, which has also been confirmed in the recent experiments [Y. Shin et al., Phys. Rev. Lett. 93, 160406 (2004)] utilizing the so-called topological phase engineering method to create multiquantum vortices. We study the stability properties of multiquantum vortices in different trap geometries by solving the Bogoliubov excitation spectra for such states. We find that there are regions in the trap asymmetry and condensate interaction strength plane in which the splitting instability of multiquantum vortices is suppressed, and hence they are dynamically stable. For example, the doubly quantized vortex can be made dynamically stable even in spherical traps within a wide range of interaction strength values. We expect that this suppression of vortex-splitting instability can be experimentally verified.

• OSTI ID: 20976533
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASYMMETRY
BOSE-EINSTEIN CONDENSATION
CONDENSATES
EXCITATION
INSTABILITY
INTERACTIONS
QUANTIZATION
SPECTRA
SPHERICAL CONFIGURATION
TEMPERATURE RANGE 0000-0013 K
TRAPS
VORTICES