Nonperiodic oscillation of bright solitons in the condensates with a   periodically oscillating harmonic potential
  Considering a periodically oscillating harmonic potential, we explore the dynamics properties of bright solitons in a Bose-Einstein condensate. It is found that under a slower oscillating potential, soliton movement exhibits a nonperiodic oscillation while it is hardly affected under a fast oscillating potential. Furthermore, the head-on and/or "chase" collisions of two solitons have been obtained, which can be controlled by the oscillating frequency of potential. 
Z. M. He, D. L. Wang, Y. C. She, and J. W. Ding
cond-mat.quant-gas