Transitions and excitations in a superfluid stream passing small impurities

Florian Pinsker, Natalia G. Berloff

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    We analyze asymptotically and numerically the motion around a single impurity and a network of impurities inserted in a two-dimensional superfluid. The criticality for the breakdown of superfluidity is shown to occur when it becomes energetically favorable to create a doublet - the limiting case between a vortex pair and a rarefaction pulse on the surface of the impurity. Depending on the characteristics of the potential representing the impurity, different excitation scenarios are shown to exist for a single impurity as well as for a lattice of impurities. Depending on the lattice characteristics it is shown that several regimes are possible: dissipationless flow, excitations emitted by the lattice boundary, excitations created in the bulk, and the formation of large-scale structures.

    Original languageEnglish
    Article number053605
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume89
    Issue number5
    DOIs
    Publication statusPublished - 2014

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