Josephson effects in dilute Bose-Einstein condensates

Year: 2000

Authors: Giovanazzi S., Smerzi A., Fantoni S.

Autors Affiliation: Ist Nazl Fis Nucl, I-34014 Trieste, Italy; Sch Adv Int Studies, I-34014 Trieste, Italy.

Abstract: We propose an experiment that would demonstrate the de and ac Josephson effects in two weakly linked Bose-Einstein condensates. We consider a time-dependent barrier, moving adiabatically across the trapping potential. The phase dynamics are governed by a driven-pendulum equation, as in current-driven superconducting Josephson junctions. At a critical velocity of the barrier (proportional to the critical tunneling current), there is a sharp transition between the de and ac regimes. The signature is a sudden jump of a large fraction of the relative condensate population. Analytical results are compared with a numerical integration of the Gross-Pitaevskii equation, inn experimentally realistic situation.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 84 (20)      Pages from: 4521  to: 4524

KeyWords: Superfluid He-3; Oscillations; Interference; Gas
DOI: 10.1103/PhysRevLett.84.4521

Citations: 136
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