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.

Journal/Review: EUROPHYSICS LETTERS

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

More Information: MA acknowledges financial support by ERC through the QGBE Grant and by Provincia Autonoma di Trento. MG and RM acknowledge financial support under Grant No. FIS2011-28617-C02-01 from MINECO (Spain), Grant No. 2009SGR1289 from Generalitat de Catalunya (Spain). DMJ acknowledges financial support under Grant PIP 11420090100243 from CONICET (Argentina). AS acknowledges financial support by the European Commission small-or medium-scale focused research project QIBEC, Contract No. 284584. QSTAR is the MPQ, LENS, IIT, UniFi Joint Center for Quantum Science and Technology in Arcetri.
KeyWords: Josephson effect; Bose-Einstein condensate
DOI: 10.1209/0295-5075/109/40005

Citations: 22
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