Self-organization effects and light amplification of collective atomic   recoil motion in a harmonic trap
  Self-organization effects related to light amplification in the collective atomic recoil laser system with the driven atoms confined in a harmonic trap are investigated further. In the dispersive parametric region, our study reveals that the spontaneously formed structures in the phase space contributes an important role to the light amplification of the probe field under the atomic motion being modified by the trap. 
L.Zhang, G.J.Yang and L.X.Xia