Dark solitons in cigar-shaped Bose-Einstein condensates of 87Rb are created by a phase imprinting method. Coherent and dissipative dynamics of the solitons has been observed.

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Journal Phys. Rev. Lett.
Citation
Burger, S, Bongs, K, Dettmer, S, Ertmer, W, Sengstock, K, Sanpera, A, … Lewenstein, M. (1999). Dark solitons in Bose-Einstein condensates. Phys.Rev.Lett., 83, 5198–5201.