Transitions and excitations in a superfluid stream passing small impurities
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AbstractWe 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.
CitationPinsker F, Berloff NG (2014) Transitions and excitations in a superfluid stream passing small impurities. Physical Review A 89. Available: http://dx.doi.org/10.1103/PhysRevA.89.053605.
SponsorsF.P. is financially supported by the UK Engineering and Physical Sciences Research Council (EPSRC) Grant No. EP/H023348/1 for the University of Cambridge Centre for Doctoral Training, the Cambridge Centre for Analysis, and a KAUST grant.
PublisherAmerican Physical Society (APS)
JournalPhysical Review A