TY - JOUR
T1 - Transitions and excitations in a superfluid stream passing small impurities
AU - Pinsker, Florian
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.
PY - 2014/5/8
Y1 - 2014/5/8
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.
UR - http://hdl.handle.net/10754/600067
UR - https://link.aps.org/doi/10.1103/PhysRevA.89.053605
UR - http://www.scopus.com/inward/record.url?scp=84985006909&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.89.053605
DO - 10.1103/PhysRevA.89.053605
M3 - Article
SN - 1050-2947
VL - 89
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
ER -