Transitions and excitations in a superfluid stream passing small impurities

Florian Pinsker; Natalia G. Berloff

doi:10.1103/PhysRevA.89.053605

Transitions and excitations in a superfluid stream passing small impurities

Florian Pinsker, Natalia G. Berloff

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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 language	English (US)
Journal	Physical Review A
Volume	89
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.89.053605
State	Published - May 8 2014
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: F.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.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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10.1103/PhysRevA.89.053605

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title = "Transitions and excitations in a superfluid stream passing small impurities",

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.",

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AU - Berloff, Natalia G.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: F.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. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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N2 - 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.

AB - 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.

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JO - Physical Review A

JF - Physical Review A

IS - 5

ER -

Transitions and excitations in a superfluid stream passing small impurities

Abstract

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