Josephson effect and quantum merging of two Bose superfluids

Details Josephson effect and quantum merging of two Bose superfluids Josephson effect and quantum merging of two Bose superfluids

2006-06-09

arxiv.org/abs/cond-mat/0606226v2

PHYSICAL REVIEW B 73, 224505 (2006)

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures. two typos in Eqs. (19) and (22) are corrected in this version

Scientific paper

10.1103/PhysRevB.73.224505

We consider the Josephson effect when two independent Bose superfluids are weakly connected. In the presence of interparticle interaction and based on the calculations of the one-particle density matrix of the whole system, we find that the one-particle density matrix can be factorized which satisfies the general criterion of Bose superfluid proposed by Penrose and Onsager. By introducing an effective order parameter for the whole system, our researches show that there is Josephson effect for two independent Bose superfluids.

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