Soliton

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© William P. Reinhardt.

A type of soliton called a "density notch soliton" can be created in a BEC by manipulating its quantum phase. The image above shows a calculation of a density notch soliton forming in a BEC, with atom density represented by color. The condensate grows until time t = 600 in a trap that splits it into two seemingly distinct (but still coherent) parts separated by a node, as indicated by the black zero-density line down the middle of the image. At t = 600, a laser impinging only on the lower half of the condensate creates a shift in phase between the two halves. The phase shift causes the position of the original node to oscillate: This is the soliton. (Unit: 6)