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arXiv · 1409.5598

Phase-slips and vortex dynamics in Josephson oscillations between Bose-Einstein condensates

Marta Abad·Muntsa Guilleumas·Ricardo Mayol·Francesco Piazza·Dora M. Jezek·Augusto Smerzi
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Abstract

We study the relation between Josephson dynamics and topological excitations in a dilute Bose-Einstein condensate confined in a double-well trap. We show that the phase slips responsible for the self-trapping regime are created by vortex rings entering and annihilating inside the weak-link region or created at the center of the barrier and expanding outside the system. Large amplitude oscillations just before the onset of self-trapping are also strictly connected with the dynamics of vortex rings at the edges of the inter-well barrier. Our results extend and analyze the dynamics of the vortex-induced phase slippages suggested a few decades ago in relation to the "ac" Josephson effect of superconducting and superfluid helium systems.

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Marta Abad, Muntsa Guilleumas, Ricardo Mayol, Francesco Piazza, Dora M. Jezek, Augusto Smerzi. 2014-09-19. Phase-slips and vortex dynamics in Josephson oscillations between Bose-Einstein condensates. https://doi.org/10.1209/0295-5075/109/40005

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