Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-11-12
Phys. Rev. A 79, 033623 (2009)
Physics
Condensed Matter
Other Condensed Matter
13 pages, 6 figures
Scientific paper
10.1103/PhysRevA.79.033623
Generation of wave structures by a two-dimensional object (laser beam) moving in a two-dimensional two-component Bose-Einstein condensate with a velocity greater than both sound velocities of the mixture is studied by means of analytical methods and systematic simulations of the coupled Gross-Pitaevskii equations. The wave pattern features three regions separated by two Mach cones. Two branches of linear patterns similar to the so-called "ship waves" are located outside the corresponding Mach cones, and oblique dark solitons are found inside the wider cone. An analytical theory is developed for the linear patterns. A particular dark-soliton solution is also obtained, its stability is investigated, and two unstable modes of transverse perturbations are identified. It is shown that, for a sufficiently large flow velocity, this instability has a convective character in the reference frame attached to the moving body, which makes the dark soliton effectively stable. The analytical findings are corroborated by numerical simulations.
Frantzeskakis Dimitri J.
Gladush Yu. G.
Kamchatnov Anatoly M.
Kevrekidis Panagiotis G.
Malomed Boris A.
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