Boson Josephson junction with trapped atoms

Raghavan, S. ; Smerzi, A. ; Fantoni, S. ; Shenoy, S. R. (1999) Boson Josephson junction with trapped atoms International Journal of Modern Physics B, 13 (5-6). pp. 633-641. ISSN 0217-9792

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We consider coherent atomic tunneling between two weakly coupled Bose-Einstein condensates at T=0 in a double-well trap. The condensate dynamics of the macroscopic amplitudes in the two wells is modeled by two Gross-Pitaevskii equations (GPE) coupled by a tunneling matrix element. Analytic elliptic function solutions are obtained for the time evolution of the inter-well fractional population imbalance z(t) (related to the condensate phase difference) of the Boson Josephson junction (BJJ). Surprisingly, the neutral-atom BJJ shows (non-sinusoidal generalizations of) effects seen in charged-electron superconductor Josephson junctions (SJJ). The BJJ elliptic-function behavior has a singular dependence on a GPE parameter ratio Λ at a critical ratio Λ=Λc, beyond which a novel 'macroscopic quantum self-trapping' effect sets in with a non-zero time-averaged imbalance < z > ≠ 0.

Item Type:Article
Source:Copyright of this article belongs to World Scientific Publishing Company.
ID Code:46045
Deposited On:30 Jun 2011 10:01
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