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

Year: 2015

Authors: Abad M., Guilleumas M., Mayol R., Piazza F., Jezek DM., Smerzi A.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy;‎ Univ Barcelona, Fac Fis, Dept Estruct & Constituents Mat, E-08028 Barcelona, Spain;‎ Univ Barcelona, Fac Fis, IN2UB, E-08028 Barcelona, Spain;‎ Tech Univ Munich, D-85748 Garching, Germany; Consejo Nacl Invest Cient & Tecn, IFIBA, RA-1428 Buenos Aires, DF, Argentina;‎ INO CNR, QSTAR, I-50125 Florence, Italy; LENS, I-50125 Florence, Italy

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. Copyright (C) EPLA, 2015

Journal/Review: EPL

Volume: 109 (4)      Pages from: 40005-1  to: 40005-6

KeyWords: Josephson effect; Bose-Einstein condensate
DOI: 10.1209/0295-5075/109/40005

Citations: 21
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