MANIPULATION OF THE TRANSVERSE DYNAMICS OF RING DARK SOLITARY WAVES

The spatial dynamics of ring dark solitary waves is studied numericall y in order to determine the appropriate initial conditions for an effe ctive control of their transverse velocity. We show that the evolution of the solitary-wave parameters radius, ring width and contrast can b e controlled by increasing the ring radius, by an initial phase modula tion of the background beam, and as a result of a nonlinear interactio n with a second dark formation.