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Stability of the quantized circulation of an attractive Bose-Einstein condensate in a rotating torus

Stability of the quantized circulation of an attractive Bose-Einstein condensate in a rotating torus

We investigate rotational properties of a system of attractive bosons confined in a one-dimensional torus. Two kinds of ground states, uniform-density and bright soliton, are obtained analytically as functions of the strength of interaction and of the rotational frequency of the torus. The quantization of circulation appears in the uniform-density …