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arXiv · 1710.10810

Is a doubly quantized vortex dynamically unstable in uniform superfluids?

Hiromitsu Takeuchi·Michikazu Kobayashi·Kenichi Kasamatsu
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Abstract

We revisit the fundamental problem of the splitting instability of a doubly quantized vortex in uniform single-component superfluids at zero temperature. We analyze the system-size dependence of the excitation frequency of a doubly quantized vortex through large-scale simulations of the Bogoliubov--de Gennes equation, and find that the system remains dynamically unstable even in the infinite-system-size limit. Perturbation and semi-classical theories reveal that the splitting instability radiates a damped oscillatory phonon as an opposite counterpart of a quasi-normal mode.

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Hiromitsu Takeuchi, Michikazu Kobayashi, Kenichi Kasamatsu. 2017-10-30. Is a doubly quantized vortex dynamically unstable in uniform superfluids?. https://doi.org/10.7566/jpsj.87.023601

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