Phase dependence of phonon tunnelling in bosonic superfluid-insulator- superfluid junctions

Ippei Danshita, Nobuhiko Yokoshi, Susumu Kurihara

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    Abstract

    We consider the tunnelling of phonon excitations across a potential barrier spatially separating two condensates with different macroscopic phases. We analyse the relation between the phase difference φ of the two condensates and the transmission coefficient T by solving the Bogoliubov equations. It is found that T strongly depends on φ, and that the perfect transmission of low-energy excitations disappears when the phase difference reaches the critical value which gives the maximum supercurrent of the condensate. We also discuss the feasibility of observing the phase differences in experiments.

    Original languageEnglish
    Article number44
    JournalNew Journal of Physics
    Volume8
    DOIs
    Publication statusPublished - 2006 Mar 28

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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