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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2022, Tutor: Ricardo Mayol Sánchez

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In this report we investigate the instability of a dark soliton imprinted in a twodimensional Bose-Einstein condensate. We have shown that depending on the form of the imprinted phase step, the soliton bends and then, via a snake instability, it decays into vortices. We have performed numerical simulations of the time evolution of the imprinted dark soliton in two-dimensions.
Finally, we have qualitatively interpreted the theoretical framework that describes this phenomenon in the approximation of weakly interacting bosons