Sign of coupling in barrier-separated Bose-Einstein condensates and stability of double-ring systems

Brand, J., Haigh, T. J. and Zülicke, U. (2010) Sign of coupling in barrier-separated Bose-Einstein condensates and stability of double-ring systems. Physical Review A, 81 2: 025602.1-025602.4. doi:10.1103/PhysRevA.81.025602

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Author Brand, J.
Haigh, T. J.
Zülicke, U.
Title Sign of coupling in barrier-separated Bose-Einstein condensates and stability of double-ring systems
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
1094-1622
1538-4446
Publication date 2010-02-08
Sub-type Article (original research)
DOI 10.1103/PhysRevA.81.025602
Open Access Status DOI
Volume 81
Issue 2
Start page 025602.1
End page 025602.4
Total pages 4
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Subject 3107 Atomic and Molecular Physics, and Optics
Formatted abstract
We revisit recent claims about the instability of nonrotating tunnel coupled annular Bose-Einstein condensates leading to the emergence of angular momentum Josephson oscillation [Phys. Rev. Lett. 98, 050401 (2007)]. It was predicted that all stationary states with uniform density become unstable in certain parameter regimes. By careful analysis, we arrive at a different conclusion. We show that there is a stable nonrotating and uniform ground state for any value of the tunnel coupling and repulsive interactions. The instability of an excited state with π phase difference between the condensates can be interpreted in terms of the familiar snake instability. We further discuss the sign of the tunnel coupling through a separating barrier, which carries significance for the nature of the stationary states. It is found to always be negative for physical reasons.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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