Transitions and excitations in a superfluid stream passing small impurities

Florian Pinsker, Natalia G. Berloff

    Результат исследований: Вклад в журналСтатьярецензирование

    5 Цитирования (Scopus)

    Аннотация

    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.

    Язык оригиналаАнглийский
    Номер статьи053605
    ЖурналPhysical Review A - Atomic, Molecular, and Optical Physics
    Том89
    Номер выпуска5
    DOI
    СостояниеОпубликовано - 2014

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