Kelvin Waves of Quantized Vortex Lines in Trapped Bose-Einstein Condensates

Details Kelvin Waves of Quantized Vortex Lines in Trapped Bose-Einstein Condensates Kelvin Waves of Quantized Vortex Lines in Trapped Bose-Einstein Condensates

2008-03-18

arxiv.org/abs/0803.2574v2

Phys. Rev. Lett. 101, 020402 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures, title changed, minor revisions

Scientific paper

10.1103/PhysRevLett.101.020402

We have theoretically investigated Kelvin waves of quantized vortex lines in trapped Bose-Einstein condensates. Counterrotating perturbation induces an elliptical instability to the initially straight vortex line, driven by a parametric resonance between a quadrupole mode and a pair of Kelvin modes of opposite momenta. Subsequently, Kelvin waves rapidly decay to longer wavelengths emitting sound waves in the process. We present a modified Kelvin wave dispersion relation for trapped superfluids and propose a simple method to excite Kelvin waves of specific wave number.

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