Topological Constraints on the Dynamics of Vortex Formation in a Two-Dimensional Quantum Fluid

被引:3
作者
Congy, T. [1 ]
Azam, P. [2 ]
Kaiser, R. [2 ]
Pavloff, N. [3 ,4 ]
机构
[1] Northumbria Univ, Dept Math Phys & Elect Engn, Newcastle Upon Tyne NE1 8ST, England
[2] Univ Cote Azur, Inst Phys Nice, CNRS, F-06560 Valbonne, France
[3] Univ Paris Saclay, CNRS, LPTMS, F-91405 Orsay, France
[4] Inst Univ France IUF, Paris, France
关键词
PHASE SINGULARITIES; DARK SOLITON; PROPAGATION; VORTICES; BEAMS; FLOW; DISLOCATIONS; SADDLES; SHOCK; INSTABILITY;
D O I
10.1103/PhysRevLett.132.033804
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present experimental and theoretical results on formation of quantum vortices in a laser beam propagating in a nonlinear medium. Topological constrains richer than the mere conservation of vorticity impose an elaborate dynamical behavior to the formation and annihilation of vortex-antivortex pairs. We identify two such mechanisms, both described by the same fold-Hopf bifurcation. One of them is particularly efficient although it is not observed in the context of liquid helium films or stationary systems because it relies on the compressible nature of the fluid of light we consider and on the nonstationarity of its flow.
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页数:8
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