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dc.contributor.authorVERMA, GUNJANen_US
dc.contributor.authorRAPOL, UMAKANT D.en_US
dc.contributor.authorNATH, REJISHen_US
dc.date.accessioned2019-07-01T05:55:26Z
dc.date.available2019-07-01T05:55:26Z
dc.date.issued2017-04en_US
dc.identifier.citationPhysical Review A, 95(4), 043618.en_US
dc.identifier.issn2469-9926en_US
dc.identifier.issn2469-9934en_US
dc.identifier.urihttp://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/3529-
dc.identifier.urihttps://doi.org/10.1103/PhysRevA.95.043618en_US
dc.description.abstractWe analyze numerically the formation and the subsequent dynamics of two-dimensional matter wave dark solitons in a Thomas-Fermi rubidium condensate using various techniques. An initially imprinted sharp phase gradient leads to the dynamical formation of a stationary soliton as well as very shallow gray solitons, whereas a smooth gradient only creates gray solitons. The depth and hence, the velocity of the soliton is provided by the spatial width of the phase gradient, and it also strongly influences the snake-instability dynamics of the two-dimensional solitons. The vortex dipoles stemming from the unstable soliton exhibit rich dynamics. Notably, the annihilation of a vortex dipole via a transient dark lump or a vortexonium state, the exchange of vortices between either a pair of vortex dipoles or a vortex dipole and a single vortex, and so on. For sufficiently large width of the initial phase gradient, the solitons may decay directly into vortexoniums instead of vortex pairs, and also the decay rate is augmented. Later, we discuss alternative techniques to generate dark solitons, which involve a Gaussian potential barrier and time-dependent interactions, both linear and periodic. The properties of the solitons can be controlled by tuning the amplitude or the width of the potential barrier. In the linear case, the number of solitons and their depths are determined by the quench time of the interactions. For the periodic modulation, a transient soliton lattice emerges with its periodicity depending on the modulation frequency, through a wave number selection governed by the local Bogoliubov spectrum. Interestingly, for sufficiently low barrier potential, both Faraday pattern and soliton lattice coexist. The snake instability dynamics of the soliton lattice is characteristically modified if the Faraday pattern is present.en_US
dc.language.isoenen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectDark solitonsen_US
dc.subjectInstability dynamicsen_US
dc.subjectDimensional condensatesen_US
dc.subjectFaraday patternen_US
dc.subjectNonlinear wavesen_US
dc.subjectQuantum fluidsen_US
dc.subjectSolids Solitonsen_US
dc.subject2017en_US
dc.titleGeneration of dark solitons and their instability dynamics in two-dimensional condensatesen_US
dc.typeArticleen_US
dc.contributor.departmentDept. of Physicsen_US
dc.identifier.sourcetitlePhysical Review Aen_US
dc.publication.originofpublisherForeignen_US
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