2014/09/19 by M. Abad, Marta Abad, Muntsa Guilleumas +7 · 3 citations
Physics and Astronomy · #Amplitude #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Dynamics (music) #Josephson effect #Mechanics #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum vortex #Quantum, superfluid, helium dynamics #Superconductivity #Superfluid helium-4 #Superfluidity #Trapping #Vortex #Vorticity #cond-mat.quant-gas
paper · pdf · doi:10.1209/0295-5075/109/40005
6 pages, 5 figures
arxiv created 2014/09/19 · openalex publication_date 2015/02/01 · arxiv updated 2015/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.